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Free improvisation is improvised music without any rules or adherence to a particular style. It came out of free jazz, classical music, and avant-garde in the '60s.
Listen to all sounds and mixes. You have the choice: Smooth Jazz, Nu-Jazz, Contemporary Jazz, Soul, Jazz Fusion, Jazz, Radioshow, Funk, Lounge, Downtempo, Swing, Jazz Fusion Instrumental, Chillout, Instrumental, Jazz-funk, Latin Jazz, Neo Jazz, Latin, Be Bop Jazz, Chillout Jazz are the most common styles where artists uploaded their music and sounds.
Other artists of this genre are John Butcher, Evan Parker, Derek Bailey, Anthony Braxton, Elliott Sharp, Alexander von Schlippenbach, Susie Ibarra, Peter Brötzmann, Mats Gustafsson, Zeena Parkins, AMM, Nels Cline, Noël Akchoté, Wadada Leo Smith, Spontaneous Music Ensemble.