The most widely-known and used free-reed aerophone in India is the harmonium and have been imported from the West. No foreign instrument, however, has caused such a commotion as the harmonium and none is used so extensively, be it in classical, light, film or folk music. It is probably the most commonly used instrument in northern India. Today’s version of the harmonium is capable of providing a whole range of tonal excellence very rare in other instruments. A top quality harmonium has two, three and even four sets of reeds. The instrument covers three to four octaves, encompassing sub-bass, bass, medium and female.