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 circle use of the instrument has not been without controversy, and flute circles are generally advised to use the instrument in a respectful manner because of these considerations. Flute circle participants may span a wide range of experience and training in music — from professionals to novice flutists or enthusiasts of the Native American flute. Many flute circles focus on raising the level of musicality of the participants across a range of levels of musical experience using basic song forms, music improvisation, and techniques of experiential music education. These techniques include duet and ensemble improvisation forms that include drones, ostinato patterns,