Drone music, drone-based music, or simply drone, is a minimalist genre that emphasizes the use of sustained sounds, notes, or tone clusters – called drones. It is typically characterized by lengthy audio programs with relatively slight harmonic variations throughout each piece. La Monte Young, one of its 1960s originators, defined it in 2000 as "the sustained tone branch of minimalism". Elements of drone music have been incorporated in diverse genres such as rock, ambient, and techno. Overview Music which contains drones and is rhythmically still or very slow, called "drone music", can be found in many parts of the world, including bagpipe traditions, among them Scottish pibroch piping; didgeridoo music in Australia, South Indian classical Carnatic music and Hindustani classical music (both of which are accompanied almost invariably by the Tanpura, a plucked, four-string instrument which is only capable of playing a drone); the sustained tones found in the Japanese gagaku classical tradition; possibly (disputed) in pre-polyphonic organum vocal music of late medieval Europe; and the Byzantine chant's ison (or drone-singing, attested after the fifteenth century). Repetition of tones, supposed to be in imitation of bagpipes, is found in a wide variety of genres and musical forms. The modern genre also called drone music (called "dronology" by some books, labels and stores, to differentiate it from ethnic drone-based music) is often applied to artists who have allied themselves closely with underground music and the post-rock or experimental music genres. Drone music forms a part of the movement referred to as minimal music. Pitchfork Media and Allmusic journalist Mark Richardson defined it thus: Development Composer La Monte Young (born 1935) is an important figure in drone music. He described himself as fascinated from a young age by droning sounds, such as "the sound of the wind blowing", the "60 cycle per second drone [of] step-down transformers on telephone poles", the tanpura drone and the alap of Indian classical music, "certain static aspects of serialism, as in the Webern slow movement of the Symphony Opus 21", and Japanese gagaku "which has sustained tones in it in the instruments such as the Sho". Young started writing music incorporating sustained tones in 1957 with the middle section of For Brass, then in 1958 what he describes as "the first work in the history of music that is completely composed of long sustained tones and silences" with Trio for Strings, before exploring this drone music