A harmonium is a keyboard instrument similar to a pump organ, but smaller. It was invented in England but become most popular in India and other eastern nations. It is played by pressing down key on the front with one hand and pumping an air pump in the back. Some harmoniums come with foot pedals for controlling the pump, allowing two-handed play. In India harmonium is also known as peti or baja. Volume is controlled by a knee-operated air valve or directly from the bellows pedals by an expression stop that allows the wind supply to bypass the reservoir. The instrument’s compass is normally four to five octaves.
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