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
Voice flute to that of the soprano voice, the origin of the term "voice flute" is obscure (; ). Revived in the early twentieth century along with other sizes of recorder, it is used today as it was in the eighteenth century—as a substitute for the transverse flute—though it also has a small repertory of music composed specially for it, from both the Baroque and modern periods. The voice flute was a popular size of recorder in the eighteenth century, especially in England. It offered an alternative instrument for amateurs to play music written for the transverse flute, since both instruments are