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The main orchestral instruments that use a double reed are the Oboe and the Bassoon.
However there are others, such as the Cor Anglais (English Horn) and contrabassoon (both bigger brothers of the oboe and bassoon respectively), as well as some period instruments, like the shawm and rackett.
A single reed instruments makes noise by vibrating the reed against the mouthpiece, a double reed instruments makes its noice by 2 reeds vibrating together. Happy Playing! musictheory1@hotmail.com
The most common double reed instruments are oboe, English horn (cor anglais) and bassoon. The oboe is a soprano instrument, the English horn is essentially an alto oboe, the tenor or baritone range of the oboe family is occupied by the now-rare Baritone oboe. The Bassoon is considered the bass of the double-reed family, although its range covers from Bass to high tenor. The Contrabassoon, used in some very large orchestral pieces, is essentially a bassoon, but twice as long, and therefore an octave lower. While these are the common orchestra and band instruments which use a double reed, there are others. For instance, the Bagpipes almost invariably use a double reed for the melody-tube (chanter), and the basque Bombarde is essentially a bagpipe chanter without a bagpipe. (The bagpipe drones are sounded with a unique type of single reed.) Double reed instruments predate single-reed melody instruments in Western Civilization music, although in Africa, single reed instruments (with a reed on much the same design as bagpipe drone reeds) are not uncommon. In ancient Greece, the double reed instruments were the Aulos (soprano) and Phagotum (a folded bass which may have given the European name to the bassoon: fagotto.)
The mouthpiece of a woodwind instrument is the part of the instrument which is placed partly in the player's mouth. Single-reed instruments have mouthpieces while exposed double-reed instruments and open flutes do not have mouthpieces. The oboe and the bassoon are two instruments that have a double reed.
Bassoon and Cor anglais.
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