![]() In common with the pipe organ, the volume and timbre of the sound is altered by drawing or closing stops, which can vary in number from three up to fifteen. Timbreĭue to its free-reed construction, the harmonium has a similar sound to the accordion, concertina and harmonica. On some larger models the wind supply may be provided by an assistant or electrically, and on these instruments a pedal keyboard was sometimes found. The player's knees may also be used to operate loudness controls (one for treble and another for bass). The player's feet are used to operate a pair of bellows pumps to provide the air supply. Most harmoniums have several different sets of reeds with varying timbres and volumes these are selected by the player using hand stops in the same way as a pipe organ. When a key is depressed, air from the bellows is forced through one or more metal reeds, which vibrate, causing a sound to be heard. It has either one or occasionally two manual keyboards. The harmonium is similar in appearance to a small organ. 5 Notable compositions featuring the harmonium.
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