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Invented in the 1840s, the harmonium is a free-standing keyboard instrument in which air is forced over reeds by means of foot-operated bellows. Pitch is determined by the size of the reeds, while sound quality is determined by the size and shape of the tone chamber surrounding each reed. It is smaller and lighter than a piano, has no pipes, and is resistant to damage. Easier to ship that a piano, it was popular in 19th-century colonies, such as India, where it has developed in what unique ways? Discuss
Source: The Free Dictionary