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
Members of the western concert flute family is sometimes referred to as a "contrabass flute in G". An instrument in the key of G, pitched a fourth below the contrabass flute in C and two octaves below the alto flute in G; it is sometimes also called a double contra-alto flute. The double contrabass flute (sometimes also called octobass flute) is pitched in the key of C, three octaves below the concert flute (two octaves below the bass flute, and one octave below the contrabass flute). Its lowest note is C, one octave below the cello's lowest C. Despite the tendency of the larger sizes of flute