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A pitch pipe is a small device (type of tuning Harmonica) used to provide a pitch reference for musicians. Although it may be described as a musical instrument , it is not typically used to play music as such.
The pitch pipe is a simple specialty harmonica that provides a reference pitch to singers and other instruments. The only difference between some early pitch-pipes and harmonicas is the name of the instrument, which reflected the maker's target audience.
412.13 Free-reed instruments feature a reed which vibrates within a closely fitting slot (there may be an attached pipe, but it should only vibrate in sympathy with the reed, and not have an effect on the pitch - instruments of this class can be distinguished from 422.3 by the lack of finger-holes). 412.131 Individual free reeds. Bawu; Party horn
The general dimensions of the 12- and 14- hole Hohner harmonicas are a bit bigger than regular diatonic harmonicas. The M36401 and M36501 harmonicas (in the key of C) are pitched one octave lower than the standard 10-hole C diatonic. Thus, hole-4 blow is the same pitch as hole-1 on a regular diatonic harmonica in the key of C.
A hand-pumped Indian harmonium, of the type used in South Asia, here used at a European jazz festival.. The pump organ or reed organ is a type of organ using free-reeds that generates sound as air flows past the free-reeds, the vibrating pieces of thin metal in a frame.
Likewise, when playing a harmonica or pitch pipe, one may alter the shape of their mouth to amplify specific overtones. Though not a wind instrument, a similar technique is used for playing the jaw harp : the performer amplifies the instrument's overtones by changing the shape, and therefore the resonance , of their vocal tract .
This interference can be avoided playing on an Orthotonophonium, since the pitch of a tone can be chosen such that only pure intervals are played. This is achieved by using a different tuning system - 72TET. Unlike a piano, where there are only twelve keys per octave, on an Orthotonophonium, the player has the choice of several pitches per tone.
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