The experimental jazz zeitgeist of the 1960s and 1970s made possible any number of unconventional instrumental groupings. The basic horn-piano-bass-drums lineup of the modern jazz era lost its mandate, as more musicians searched for fresh and unusual sonorities. Ornette Coleman's bands did away with the piano; Cecil Taylor's trio with Jimmy Lyons and Sunny Murray eliminated the bass. Musicians associated with the Chicago-based AACM occasionally did away with one or more (or all) elements of the rhythm section; for example