Monday, July 26, 2010

Harmonium





A harmonium is a free-standing keyboard instrument similar to a reed organ. Sound is produced by air, supplied by foot-operated or hand-operated bellows, being blown through sets of free reeds, resulting in a sound similar to that of an accordion.
History:
The harmonium was invented in Paris in 1842 by Alexandre Debain, though there was concurrent development of similar instruments. Christian Gottlieb Kratzenstein (1723-1795), Professor of Physiology at Copenhagen, was credited with the first free reed to be made in the western world after winning the annual prize in 1780 from the Imperial Academy of St.Petersburg.
Harmoniums reached the height of their popularity in the West in the late 19th and early 20th centuries. They were especially popular in small
churches and chapels where a pipe organ would be too large or too expensive. Harmoniums generally weigh less than similarly-sized pianos and are not as easily damaged in transport, thus they were also popular throughout the colonies of the European powers in this period not only because it was easier to ship the instrument out to where it was needed, but it was also easier to transport overland in areas where good-quality roads and railways may have been non-existent. An added attraction of the harmonium in tropical regions was that the instrument held its tune regardless of heat and humidity, unlike the piano. This 'export' market was sufficiently lucrative for manufacturers to produce harmoniums with cases impregnated with chemicals to prevent woodworm and other damaging organisms found in the tropics.
At the peak of the instruments' Western popularity around 1900, a wide variety of styles of harmoniums were being produced. These ranged from simple models with plain cases and only 4 or 5
stops (if any at all), up to large instruments with ornate cases, up to a dozen stops and other mechanisms such as couplers. Expensive harmoniums were often built to resemble pipe organs, with ranks of fake pipes attached to the top of the instrument. Small numbers of harmoniums were built with two manuals (keyboards). Some were even built with pedal keyboards, which required the use of an assistant to run the bellows or, for some of the later models, an electrical pump. These larger instruments were mainly intended for home use, such as allowing organists to practise on an instrument on the scale of a pipe organ, but without the physical size or volume of such an instrument. For missionaries, chaplains in the armed forces, travelling evangelists, and the like, reed organs that folded up into a container the size of a very large suitcase or small trunk were made; these had a short keyboard and few stops, but they were more than adequate for keeping hymn-singers more-or-less on pitch.
The invention of the
electronic organ in the mid-1930s spelt the end of the harmonium's success in the West (although its popularity as a household instrument declined in the 1920s as musical tastes changed). The Hammond organ could imitate the tonal quality and range of a pipe organ whilst retaining the compact dimensions and cost-effectiveness of the harmonium whilst reducing maintenance needs and allowing a greater number of stops and other features. By this time harmoniums had reached high levels of mechanical complexity, not only through the need to provide instruments with a greater tonal range, but (especially in North America) due to patent laws. It was common for manufacturers to patent the action mechanism used on their instruments, thus requiring any new manufacturer to develop their own version- as the number of manufacturers grew this led to some instruments having hugely complex arrays of levers, cranks, rods and shafts which made replacement with an electronic instrument even more attractive.
The last mass-producer of harmoniums in the West was the
Estey company, which ceased manufacture in the mid-1950s. As the existing stock of instruments aged and spare parts became hard to find, more and more were either scrapped or sold. It was not uncommon for harmoniums to be 'modernised' by having electric blowers fitted, often very unsympathetically. The majority of Western harmoniums today are in the hands of enthusiasts, though the instrument remains popular in South Asia.
The South Asian harmonium has undergone changes, however, from the Western prototype. South Asian music is based on melody, rather than harmony, which makes two-handed playing unnecessary, and South Asian musicians are used to sitting cross-legged on the ground or kneeling to play, rather than on a chair or bench. Hence, the substructure has been removed, and the bellows moved to the back of the instrument, where they are operated with one hand while the other plays the keyboard. Drone-stops for a bagpipe-like effect have also been added.
A relatively modern example of the use of a harmonium in European music can be found in
The Beatles' songs such as "We Can Work It Out" and "Cry Baby Cry".






Construction:

Harmoniums consist of banks of brass reeds (metal tongues which vibrate when air flows over them), a pumping apparatus, stops for drones (some models feature a stop which causes a form of vibrato), and a keyboard. The harmonium's timbre, despite its similarity to the accordion's, is actually produced in a critically different way. Instead of the bellows causing a direct flow of air over the reeds, an external feeder bellows inflates an internal reservoir bellows inside the harmonium from which air escapes to vibrate the reeds. This design is similar to bagpipes as it allows the harmonium to create a continuously sustained sound. (Some better-class harmoniums of the 19th and early 20th centuries incorporated an “expression stop” which bypassed the reservoir, allowing a skilled player to regulate the strength of the air-flow directly from the pedal-operated bellows and so to achieve a certain amount of direct control over dynamics.) If a harmonium has two sets of reeds, it's possible that the second set of reeds (either tuned unison or an octave lower) can be activated by a stop, which means each key pressed will play two reeds. Professional harmoniums feature a third set of reeds, either tuned an octave higher or in unison to the middle reed. This overall makes the sound fuller. In addition, many harmoniums feature an octave coupler, a mechanical linkage that opens a valve for a note an octave above or below the note being played, and a scale changing mechanism, which allows one to play in various keys while fingering the keys of one scale.
Harmoniums are made with 1, 2, 3 and occasionally 4 sets of reeds. Classical instrumentalists usually use 1-reed harmoniums, while a musician who plays for a
qawaali (Islamic devotional singing) usually uses a 3-reed harmonium.

India
During the mid-19th century missionaries brought French-made hand-pumped harmoniums to India. The instrument quickly became popular there: it was portable, reliable and easy to learn. It has remained popular to the present day, and the harmonium remains an important instrument in many genres of Indian music. It is commonly found in Indian homes. Though derived from the designs developed in France, the harmonium was developed further in India in unique ways, such as the addition of drone stops and a scale changing mechanism.
In
Kolkata, Dwarkanath Ghose of the renowned Dwarkin was adept in modifying musical instruments to the individual needs of users and is particularly remembered for modifying the imported harmony flute and producing the hand held harmonium, which has subsequently become an integral part of the Indian music scenario.[1] Dwijendranath Tagore is credited with having used the imported instrument in 1860 in his private theatre, but it was probably a pedalled instrument which was cumbersome, or it was possibly some variation of the reed organ. Initially, it aroused curiosity but gradually people started playing it[2] and Ghose took the initiative to modify it.[1] It was in response to the Indian needs that the hand-held harmonium was introduced. All Indian musical instruments are played with the musician sitting on the floor or on a stage, behind the instrument or holding it in his hands. In that era, Indian homes did not use tables and chairs.[1] Also, Western music being harmonically based, both a player's hands were needed to play the chords, thus assigning the bellows to the feet was the best solution; Indian music being melodically based, only one hand was necessary to play the melody, the other hand was free for the bellows.
The harmonium was widely accepted in Indian music, particularly Parsi and Marathi stage music, in the late 19th century. By the early 20th century, however, in the context of nationalist movements that sought to depict India as utterly separate from the West, the harmonium came to be portrayed as an unwanted foreigner. Technical concerns with the harmonium included its inability to produce meend (slides between notes) and the fact that, once tuned, it cannot be adjusted in the course of performance. The former prevents it from articulating the subtle inflections (such as andolan, gentle oscillation) so crucial to many ragas; the latter prevents it from articulating the subtle differences in intonational color between a given svara in two different ragas. For these reasons, it was banned from All-India Radio from 1940 to 1971. (Indeed, a ban still stands on harmonium solos.) On the other hand many of the harmonium's qualities suited it very well for the newly-reformed classical music of the early 20th century: it is easy for amateurs to learn; it supports group singing and large voice classes; it provides a template for standardized raga grammar; it is loud enough to provide a drone in a concert hall. For these reasons, it has become the instrument of choice for accompanying most North Indian classical vocal genres, though it is still despised as a foreigner by many connoisseurs of Indian music, who prefer the
sarangi as an accompanying instrument for khyal singing.
A popular usage is by followers of various
Hindu and Sikh faiths, who use it in the devotional singing of prayers, called bhajan or kirtan. There will be at least one harmonium in any mandir (Hindu temple) or gurdwara (Sikh temple) around the world. The harmonium is also commonly accompanied by the tabla as well as a dholak. To Sikhs the harmonium is known as the vaja/baja. It is also referred to as a "Peti" (A loose reference to a "Box") in some parts of North India and Maharashtra.
The harmonium plays an integral part in
Qawwali music. Almost all Qawwals use the harmonium as their sole musical accompaniment. It has received international fame as the genre of Qawwali music has been popularized by renowned Pakistani musicians such as Nusrat Fateh Ali Khan.

Flute















The flute is a musical instrument of the woodwind family. Unlike woodwind instruments with reeds, a flute is an aerophone or reedless wind instrument that produces its sound from the flow of air across an opening. According to the instrument classification of Hornbostel-Sachs, flutes are categorized as Edge-blown aerophones.
A
musician who plays the flute can be referred to as a flute player, a flautist, a flutist, or less commonly a fluter.
Flutes are the
earliest known musical instruments. A number of flutes dating to about 40,000 to 35,000 years ago have been found in the Swabian Alb region of Germany. These flutes demonstrate that a developed musical tradition existed from the earliest period of modern human presence in Europe.





History:

The oldest flute ever discovered may be a fragment of the femur of a juvenile cave bear, with two to four holes, found at Divje Babe in Slovenia and dated to about 43,000 years ago. The authenticity of this fact, however, is often disputed. In 2008 another flute dated back to at least 35,000 years ago was discovered in Hohle Fels cave near Ulm, Germany. The five-holed flute has a V-shaped mouthpiece and is made from a vulture wing bone. The researchers involved in the discovery officially published their findings in the journal Nature, in August 2009. The discovery is also the oldest confirmed find of any musical instrument in history.The flute, one of several found, was found in the Hohle Fels cavern next to the Venus of Hohle Fels and a short distance from the oldest known human carving. On announcing the discovery, scientists suggested that the "finds demonstrate the presence of a well-established musical tradition at the time when modern humans colonized Europe". Scientists have also suggested that the discovery of the flute may help to explain "the probable behavioural and cognitive gulf between" Neanderthals and early modern human.
A three-holed flute, 18.7 cm long, made from a
mammoth tusk (from the Geißenklösterle cave, near Ulm, in the southern German Swabian Alb and dated to 30,000 to 37,000 years ago)was discovered in 2004, and two flutes made from swan bones excavated a decade earlier (from the same cave in Germany, dated to circa 36,000 years ago) are among the oldest known musical instruments.
Playable 9000-year-old
Gudi (literally, "bone flute"), made from the wing bones of red-crowned cranes, with five to eight holes each, were excavated from a tomb in Jiahu[10] in the Central Chinese province of Henan.

The earliest extant transverse flute is a chi (
) flute discovered in the Tomb of Marquis Yi of Zeng at the Suizhou site, Hubei province, China. It dates from 433 BC, of the later Zhou Dynasty. It is fashioned of lacquered bamboo with closed ends and has five stops that are at the flute's side instead of the top. Chi flutes are mentioned in Shi Jing, compiled and edited by Confucius, according to tradition.
The Bible, in Genesis 4:21, cites Jubal as being the "father of all those who play the ugab and the kinnor". The former Hebrew term refers to some wind instrument, or wind instruments in general, the latter to a stringed instrument, or stringed instruments in general. As such, Jubal is regarded in the Judeo-Christian tradition as the inventor of the flute (a word used in some translations of this biblical passage). Some early flutes were made out of tibias (shin bones). The flute has also always been an essential part of Indian culture and mythology, and the cross flute believed by several accounts to originate in India as Indian literature from 1500 BCE has made vague references to the cross flute.





Flute acoustics:
A flute produces sound when a stream of air directed across a hole in the instrument creates a vibration of air at the hole.
The air stream across this hole creates a
Bernoulli, or siphon, effect leading to a von Karman vortex street. This excites the air contained in the usually cylindrical resonant cavity within the flute. The player changes the pitch of the sound produced by opening and closing holes in the body of the instrument, thus changing the effective length of the resonator and its corresponding resonant frequency. By varying the air pressure, a flute player can also change the pitch of a note by causing the air in the flute to resonate at a harmonic other than the fundamental frequency without opening or closing any holes.
To be louder, a flute must use a larger resonator, a larger air stream, or increased air stream
velocity. A flute's volume can generally be increased by making its resonator and tone holes larger. This is why a police whistle, a form of flute, is very wide for its pitch, and why a pipe organ can be far louder than a concert flute: a large organ pipe can contain several cubic feet of air, and its tone hole may be several inches wide, while a concert flute's air stream measures a fraction of an inch across.
The air stream must be directed at the correct angle and velocity, or else the air in the flute will not vibrate. In
fippled or ducted flutes, a precisely formed and placed windway will compress and channel the air to the labium ramp edge across the open window. In the pipe organ, this air is supplied by a regulated blower.
In non-fipple flutes, the air stream is shaped and directed by the player's lips, called the
embouchure. This allows the player a wide range of expression in pitch, volume, and timbre, especially in comparison to fipple/ducted flutes. However, it also makes an end blown flute or transverse flute considerably more difficult for a beginner to produce a full sound on than a ducted flute, such as the recorder. Transverse and end-blown flutes also take more air to play, which requires deeper breathing and makes circular breathing a considerably trickier proposition.
Generally, the quality called timbre or "tone colour" varies because the flute can produce
harmonics in different proportions or intensities. The tone color can be modified by changing the internal shape of the bore, such as the conical taper, or the diameter-to-length ratio. A harmonic is a frequency that is a whole number multiple of a lower register, or "fundamental" note of the flute. Generally the air stream is thinner (vibrating in more modes), faster (providing more energy to excite the air's resonance), and aimed across the hole less deeply (permitting a more shallow deflection of the air stream) in the production of higher harmonics or upper partials.
Head joint geometry appears particularly critical to acoustic performance and tone, but there is no clear consensus on a particular shape amongst manufacturers. Acoustic impedance of the embouchure hole appears the most critical parameter. Critical variables affecting this acoustic impedance include: chimney length (hole between lip-plate and head tube), chimney diameter, and radii or curvature of the ends of the chimney and any designed restriction in the "throat" of the instrument, such as that in the Japanese
Nohkan Flute.
A study in which professional players were blindfolded could find no significant differences between instruments made from a variety of different metals. In two different sets of blind listening, no instrument was correctly identified in a first listening, and in a second, only the silver instrument was identified. The study concluded that there was "no evidence that the wall material has any appreciable effect on the sound color or dynamic range of the instrument". Unfortunately, this study did not control for headjoint design, which is generally known to affect tone (see above). Controlled tone tests show that the tube mass does make a difference and therefore tube density and wall thickness will make a difference.





Categories of flute
In its most basic form, a flute can be an open tube which is blown like a bottle. There are several broad classes of flutes. With most flutes, the musician blows directly across the edge of the mouthpiece. However, some flutes, such as the whistle, gemshorn, flageolet, recorder, tin whistle, tonette, fujara, and ocarina have a duct that directs the air onto the edge (an arrangement that is termed a "fipple"). These are known as fipple flutes. The fipple gives the instrument a distinct timbre which is different from non-fipple flutes and makes the instrument easier to play, but takes a degree of control away from the musician.
Another division is between side-blown (or
transverse) flutes, such as the Western concert flute, piccolo, fife, dizi, and bansuri; and end-blown flutes, such as the ney, xiao, kaval, danso, shakuhachi, Anasazi flute, and quena. The player of a side-blown flute uses a hole on the side of the tube to produce a tone, instead of blowing on an end of the tube. End-blown flutes should not be confused with fipple flutes such as the recorder, which are also played vertically but have an internal duct to direct the air flow across the edge of the tone hole.
Flutes may be open at one or both ends. The
ocarina, xun, pan pipes, police whistle, and bosun's whistle are closed-ended. Open-ended flutes such as the concert flute and the recorder have more harmonics, and thus more flexibility for the player, and brighter timbres. An organ pipe may be either open or closed, depending on the sound desired.
Flutes can be played with several different air sources. Conventional flutes are blown with the mouth, although some cultures use
nose flutes. The flue pipes of organs, which are acoustically similar to duct flutes, are blown by bellows or fans.

Keyboard
















A musical keyboard is the set of adjacent depressible levers or keys on a musical instrument, particularly the piano. Keyboards typically contain keys for playing the twelve notes of the Western musical scale, with a combination of larger, longer keys and smaller, shorter keys that repeats at the interval of an octave. Depressing a key on the keyboard causes the instrument to produce sounds, either by mechanically striking a string or tine (piano, electric piano, clavichord); plucking a string (harpsichord); causing air to flow through a pipe (organ); or strike a bell (carillon). On electric and electronic keyboards, depressing a key connects a circuit (Hammond organ, digital piano, synthesizer). Since the most commonly encountered keyboard instrument is the piano, the keyboard layout is often referred to as the "piano keyboard".




Description:

The twelve notes of the Western musical scale are laid out with the lowest note on the left;the longer keys (for the seven "natural" notes of the C major scale: C, D, E, F, G, A, B) jut forward. Because these keys were traditionally covered in ivory they are often called the white notes or white keys. The keys for the remaining five notes which are not part of the C major scale (namely C♯/D♭, D♯/E♭, F♯/G♭, G♯/A♭, A♯/B♭) (see Sharp and Flat) are raised and set back. Because these keys receive less wear, they are often made of black colored wood and called the black notes or black keys. The pattern repeats at the interval of an octave.
The arrangement of longer keys for C major with intervening, shorter keys for the intermediate semitones dates to the 15th century. Many keyboard instruments dating from before the nineteenth century, such as harpsichords and pipe organs, have a keyboard with the colours of the keys reversed: the white notes are made of ebony and the black notes are covered with softer white bone. A few electric and electronic instruments from the 1960s and subsequent decades have also done this; Vox's electronic organs of the 1960s, Farfisa's FAST portable organs, Hohner's
Clavinet L, one version of Korg's Poly-800 synthesizer and Roland's digital harpsichords.
Some 1960s electronic organs used reverse colors or gray sharps or naturals to indicate the lower part(s) of a split or 'broken' keyboard: one which is divided into two parts, each of which produces a different
Registration or sound. Such keyboards allow melody and contrasting accompaniment to be played without the expense of a second manual and were a regular feature in Spanish and some English organs of the renaissance and baroque. The break was between middle C and C-sharp, or outside of Iberia between B and C. Broken keyboards reappeared in 1842 with the harmonium, the split occurring at e4/f4.
The reverse-colored keys on
Hammond organs such as the B3, C3 and A100 are latch-style radio buttons for selecting pre-set sounds.

Size and historical variation:

The chromatic compass of keyboard instruments has tended to increase. Harpsichords often extended over five octaves (61+ keys) in the 18th century, while most pianos manufactured since about 1870 have 88 keys. Some modern pianos have even more notes (a Bösendorfer 225 has 92 and a Bösendorfer 290 "Imperial" has 97 keys). While modern synthesizer keyboards commonly have either 61, 76 or 88 keys, small MIDI controllers are available with 25 notes. Organs normally have 61 keys per manual, though some spinet models have 44 or 49. An organ pedalboard is a keyboard with long pedals which are played by the organist's feet. Pedalboards vary in size from 12 to 32 notes.
In a typical keyboard layout, black note keys have uniform width, and white note keys have uniform width and uniform spacing at the front of the keyboard. In the larger gaps between the black keys, the width of the natural notes C, D and E differ slightly from the width of keys F, G, A and B. This allows close to uniform spacing of 12 keys per octave while maintaining uniformity of seven "natural" keys per octave.
Over the last three hundred years, the octave span distance found on historical keyboard instruments (organs,
virginals, clavichords, harpsichords, and pianos) has ranged from as little as 125 mm to as much as 170 mm. Modern piano keyboards ordinarily have an octave span of 164–165 mm; resulting in the width of black keys averaging 13.7 mm and white keys about 23.5 mm wide at the base, disregarding space between keys. Several reduced-size standards have been proposed and marketed. A 15/16 size (152 mm octave span) and the 7/8 DS Standard (140 mm octave span) keyboard developed by Christopher Donison in the 1970s and developed and marketed by Steinbuhler & Company. U.S. pianist Hannah Reiman has promoted piano keyboards with narrower octave spans and has a U.S. patent on the apparatus and methods for modifying existing pianos to provide interchangeable keyboards of different sizes.
There have been variations in the design of the keyboard to address technical and musical issues. The earliest designs of keyboards were based heavily on the notes used in
Gregorian chant (the seven diatonic notes plus B-flat) and as such would often include B♭ and B♮ both as diatonic "white notes," with the B♮ at the leftmost side of the keyboard and the B♭ at the rightmost. Thus, an octave would have eight "white keys" and only four "black keys." The emphasis on these eight notes would continue for a few centuries after the "seven and five" system was adopted, in the form of the short octave: the eight aforementioned notes were arranged at the leftmost side of the keyboard, compressed in the keys between E and C (at the time, accidentals that low were very uncommon and thus not needed). During the sixteenth century, when instruments were often tuned in meantone temperament, some harpsichords were constructed with the G♯ and E♭ keys split into two. One portion of the G♯ key operated a string tuned to G♯ and the other operated a string tuned to A♭, similarly one portion of the E♭ key operated a string tuned to E♭, the other portion operating a string tuned to D♯. This type of keyboard layout, known as the enharmonic keyboard, extended the flexibility of the harpsichord, enabling composers to write keyboard music calling for harmonies containing the so-called wolf fifth (G-sharp to E-flat), but without producing aural discomfort in the listeners (see: Split sharp). The "broken octave," a variation of the aforementioned short octave, similarly used split keys to add accidentals left out of the Other examples of variations in keyboard design include the Janko keyboard and the chromatic keyboard systems on the chromatic button accordion and bandoneón.
On electric and electronic keyboards, there is an electric switch under each key. Depressing a key connects a circuit, which causes the tone generation mechanism to be triggered. Most electronic keyboards use a
matrix circuit in which the rows and columns are made up of wiring. Without a matrix circuit, a 61-key keyboard would have to have 61 wires into the integrated circuit of the keyboard. With the matrix circuit, the entire keyboard can send signals to the integrated circuit with two matrices of eight wires that are conceptually arranged into columns and rows. The keyboard controller scans all of the columns, to determine if a key has been pressed. If a key in the column has been pressed, then the controller scan the rows, to determine which row has been activated. In a manner analogous to the children's board game "Battleship!", the keyboard controller determines which key has been pressed, and then closes the switch for that key's note. This entire process takes place so quickly that the performer is not aware of the delay.


Playing techniques:



Despite their apparent similarity, keyboard instruments of different types require different techniques. For instance, a piano will produce a louder note the faster the key is pressed. On the other hand, the volume and timbre of the sound on the pipe organ are dictated by the flow of air from the bellows and the stops selected by the player; in the harpsichord the strings are plucked and the volume of the note is not perceptibly varied by using a different touch on the keyboard. Players of these instruments must use other techniques to color the sound. The arranger keyboard uses preset drum rhythms that respond to chords played in the left hand by the instrumentalist, with other buttons and switches used to change rhythms and even the voice of the instrument.

A typical piano keyboard.
Playing a keyboard instrument can prove to be a challenging task; even though the layout is quite simple and all notes are easily accessible, some music puts high demand on the performer's skills to play accurately and in
tempo, and beginners will often struggle to produce a passable rendition of a simple piece due to technique deficiency, which takes training to improve. The sequence of movements executed by the playing hand can be almost arbitrarily complicated, with some possible problems being wide-spanned chords, which can be problematic for people with small hands, chords that require unusual hand positions which can initially be uncomfortable or even painful, and also fast scales, trills and arpeggios.
Playing instruments with dynamic keyboards (i.e. ones that respond to varying force with which the key is struck) may require independence of the fingers so that some fingers are able to strike harder while others play more softly. Players need to learn to coordinate two hands and use them independently. Most music is written for two hands; typically the right hand plays the
melody in the treble range, while the left plays an accompaniment of bass notes and chords in the bass range. There exist pieces of non-trivial music written for the left hand alone, e.g. several of the Godowsky's 53 Studies on Chopin's Etudes and Ravel's Piano Concerto for the Left Hand. In music that uses counterpoint technique, both hands play different melodies at the same time.

Drums
















The drum is a member of the percussion group of music instruments, technically classified as the membranous.Drums consist of at least one membrane, called a drumhead or drum skin, that is stretched over a shell and struck, either directly with the player's hands, or with a drumstick, to produce sound. Other techniques have been used to cause drums to make sound, such as the thumb roll. Drums are the world's oldest and most ubiquitous musical instruments, and the basic design has remained virtually unchanged for thousands of years. Most drums are considered "untuned instruments", however many modern musicians are beginning to tune drums to songs; Terry Bozzio has constructed a kit using diatonic and chromatically tuned drums. A few types of drums such as timpani are always tuned to a certain pitch. Often, several drums are arranged together to create a drum kit.




Construction:

Drum carried by John Unger, Company B, 40th Regiment New York Veteran Volunteer Infantry Mozart Regiment, December 20, 1863
The shell almost invariably has a circular opening over which the drumhead is stretched, but the shape of the remainder of the shell varies widely. In the western musical tradition, the most usual shape is a
cylinder, although timpani, for example, use bowl-shaped shells. Other shapes include a frame design (tar, Bodhrán), truncated cones (bongo drums, Ashiko), goblet shaped (djembe), and joined truncated cones (talking drum).
Drums with cylindrical shells can be open at one end (as is the case with
timbales), or can have two drum heads. Single-headed drums normally consist of a skin which is stretched over an enclosed space, or over one of the ends of a hollow vessel. Drums with two heads covering both ends of a cylindrical shell often have a small hole somewhat halfway between the two heads; the shell forms a resonating chamber for the resulting sound. Exceptions include the African slit drum, also known as a log drum as it is made from a hollowed-out tree trunk, and the Caribbean steel drum, made from a metal barrel. Drums with two heads can also have a set of wires, called snares, held across the bottom head, top head, or both heads, hence the name snare drum.
On modern
band and orchestral drums, the drumhead is placed over the opening of the drum, which in turn is held onto the shell by a "counterhoop" (or "rim), which is then held by means of a number of tuning screws called "tension rods" which screw into lugs placed evenly around the circumference. The head's tension can be adjusted by loosening or tightening the rods. Many such drums have six to ten tension rods. The sound of a drum depends on several variables, including shape, size and thickness of its shell, materials from which the shell was made, counterhoop material, type of drumhead used and tension applied to it, position of the drum, location, and the velocity and angle in which it is struck.
Prior to the invention of tension rods drum skins were attached and tuned by rope systems such as that used on the
Djembe or pegs and ropes such as that used on Ewe Drums, a system rarely used today, although sometimes seen on regimental marching band snare drums.
Sound of a drum:

Several factors determine the sound a drum produces, including the type, shape and construction of the drum shell, the type of drum heads it has, and the tension of these drumheads. Different drum sounds have different uses in music. Take, for example, the modern Tom-tom drum. A jazz drummer may want drums that sound crisp, clean, and a little on the soft side, whereas a rock and roll drummer may prefer drums that sound loud and deep. Since these drummers want different sounds, their drums will be constructed a little differently.
The drum head has the most effect on how a drum sounds. Each type of drum head serves its own musical purpose and has its own unique sound. Thicker drum heads are lower-pitched and can be very
loud. Drum heads with a white plastic coating on them muffle the overtones of the drum head slightly, producing a less diverse pitch. Drum heads with central silver or black dots tend to muffle the overtones even more. And drum heads with perimeter sound rings mostly eliminate overtones (Howie 2005). Some jazz drummers avoid using thick drum heads, preferring single ply drum heads or drum heads with no muffling. Rock drummers often prefer the thicker or coated drum heads.
The second biggest factor affecting the sound produced by a drum is the tension at which the drum head is held against the shell of the drum. When the hoop is placed around the drum head and shell and tightened down with tension rods, the tension of the head can be adjusted. When the tension is increased, the
amplitude of the sound is reduced and the frequency is increased, making the pitch higher and the volume lower.
The type of shell also affects the sound of a drum. Because the vibrations
resonate in the shell of the drum, the shell can be used to increase the volume and to manipulate the type of sound produced. The larger the diameter of the shell, the lower the pitch wholesome sound while mahogany raises the frequency of low pitches and keeps higher frequencies at about the same speed. When choosing a set of shells, a jazz drummer may want smaller maple shells, while a rock drummer may want larger birch shells. For more information about tuning
drums or the physics of a drum.


History:

[Animal drumming
Macaque monkeys drum objects in a rhythmic way to show social dominance and this has been shown to be processed in a similar way in their brains to vocalizations suggesting an evolutionary origin to drumming as part of social communication. Other primates make drumming sounds by chest beating or hand clapping, and rodents such as kangaroo rats also make similar sounds using their paws on the ground.
Talking drums
In the past drums have been used not only for their musical qualities, but also as a means of
communication, especially through signals. The talking drums of Africa can imitate the inflections and pitch variations of a spoken language and are used for communicating over great distances. Throughout Sri Lankan history drums have been used for communication between the state and the community, and Sri Lankan drums have a history stretching back over 2500 years.
Military uses
Chinese troops used
tàigǔ drums to motivate troops, to help set a marching pace, and to call out orders or announcements. For example, during a war between Qi and Lu in 684 BC, the effect of drum on soldier's morale is employed to change the result of a major battle. Fife-and-drum corps of Swiss mercenary foot soldiers also used drums. They used an early version of the snare drum carried over the player's right shoulder, suspended by a strap (typically played with one hand using traditional grip). It is to this instrument that the English word "drum" was first used. Similarly, during the English Civil War rope-tension drums would be carried by junior officers as a means to relay commands from senior officers over the noise of battle. These were also hung over the shoulder of the drummer and typically played with two drum sticks. Different regiments and companies would have distinctive and unique drum beats which only they would recognize. In the mid 1800's, the Scottish military started incorporating pipe bands into their Highland Regiments.
Types of drum:
Aburukuwa
Ashiko
Bass drums
Batá
Bodhrán
Bongo drums
Bougarabou
Cajón
Cocktail drum
Chenda
Conga
Darbuka
Davul
Damphu
Dhak
Dhimay
Dhol
Dholak
Djembe
Dong Son drum
Drum kit
Ewe Drums
Goblet drum
Hand drum
Kpanlogo
Log drum
Madal
Mridangam
Side drum (Marching snare drum)
Slit drum
Snare drum
Steelpan (Steel drum)
Tabor
Tamborim
Tambourine
Taiko
Tabla
Talking drum
Tapan
Tar
Tavil
Tenor drums
Timbales
Tom-tom drum
Repinique
Surdo