Choreography evolved no less rapidly. Methods of composition vary radicallysome choreographers using their dancers improvisations as raw material, others devising every movement prior to rehearsal. Merce Cunningham radically changed the context for choreography in his attitude to music and decor as coincidental (rather than collaborative or supportive) to dance, in his employment of chance methods in dance composition and organization, and in his use of nontheatrical performance space. More Info below.