“Mr. Coleman widened the options in jazz and helped change its course. Partly through his example in the late 1950s and early ’60s, jazz became less beholden to the rules of harmony and rhythm, and gained more distance from the American songbook repertoire. His own music, then and later, became a new form of highly informed folk song: deceptively simple melodies for small groups with an intuitive, collective language, and a strategy for playing without preconceived chord sequences.”