The Breakbeat reference article from the English Wikipedia on 24-Apr-2004
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Breakbeat

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Breakbeat / Drum and bass
Stylistic origins: Rave, Techno, Hip-hop, Dancehall
Cultural origins: mid-1990s, London
Typical instruments: Synthesizer - Drum machine - Sequencer - Keyboard - Sampler
Mainstream popularity: Small, largely in late 1990s United Kingdom and Europe
Derivative forms:
Subgenres
2Step - Hardcore - Breakcore - Brokenbeat - Chemical breaks - Drill n bass - Drum n' bass - Jungle
Other topics
Notable breakbeat artists

Breakbeat (breakbeats or breaks), are a collection of sub-genres of electronic music, chiefly exemplified by drum and bass and jungle, usually characterized by a non 4/4 drum pattern (as opposed to the steady beat of house or trance).

See also

Electronic music | Genres
Ambient | Breakbeat | Electronica | Electronic art music | House | Trance | Industrial | Synth pop