Flute hyperbass are other rare forms of the flute pitched two, three, and four octaves below middle C respectively. Other sizes of flutes and piccolos are used from time to time. A rarer instrument of the modern pitching system is the treble G flute. Instruments made according to an older pitch standard, used principally in wind-band music, include D piccolo, soprano flute (the primary instrument, equivalent to today's concert C flute), F alto flute, and B bass flute. The bamboo flute is an important instrument in Indian classical music, and developed independently of the Western flute. The Hindu God Lord Krishna
Flute Indian culture and mythology, and the cross flute believed by several accounts to originate in India as Indian literature from 1500 BCE has made vague references to the cross flute. A flute produces sound when a stream of air directed across a hole in the instrument creates a vibration of air at the hole. The airstream creates a Bernoulli or siphon. This excites the air contained in the usually cylindrical resonant cavity within the flute. The flutist changes the pitch of the sound produced by opening and closing holes in the body of the instrument, thus changing the effective length