A harmonium is a musical instrument which appears similar to a Pipe organ or Reed Organ. There are free notes and reeds that are created by the air exhaled via the reeds and the air gets rendered by the manual bellows operated by the players. Harmoniums are very popular instruments in India that was introduced during the rule of the British.
When compared with the same sized pianos, harmoniums were preferred during the ancient European period because they were not expensive and are lightweight and easily transportable without damages. Several churches and chapels in those days used harmoniums especially when pianos and pipe organs were out of the budget.
Today, harmonium plays a very important role in every Indian music. The design of this self standing musical instrument was initiated in France, but it was further designed and developed in India in several different ways. The instrument is also very common in every Indian household and you can also find it in the Hindu temples worldwide.