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.
Construction
Harmoniums consist of banks of brass reeds, a pumping apparatus, stops for drones and a keyboard. The harmonium's timbre, despite its similarity to the accordion's, is actually produced in a critically different way.
There is some discussion of Indian harmonium-makers producing reproductions of Western-style reed organs for the export trade.
Shruti harmonium
The 22-śruti harmonium
Dr. Vidyadhar Oke has developed a 22-shruti harmonium,
Samvadini
Samvadini - a modified version of harmonium to perform solo on the instrument.
Pt. Bhishmadev Vedi is said to have been the first to contemplate improving the instrument by augmenting it with a string box like a harp attached to the top of the instrument.
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