found: Work cat.: Coleman, O. Free jazz, p1999.
found: New Grove, 2nd ed. WWW site, Mar. 18, 2003(Free jazz: a term applied to the avant-garde jazz of the 1960s, particularly the work of Ornette Coleman, Cecil Taylor and Albert Ayler, and the late work of John Coltrane)
found: All-Music Guide WWW site, Mar. 18, 2003(Free jazz was a radical departure from past styles, for typically after playing a quick theme, the soloist does not have to follow any progression or structure and can go in any unpredictable direction)