"Cosmos" is a hard-to-find, alternately chaotic and tightly organized mid-'70s session that was issued on the Cobra, and then Inner City labels. Sun Ra provided some stunning moments on the Rocksichord, while leading The Arkestra through stomping full-band cuts of atmospheric or alternately hard bop compositions, peeling off various saxophonists for skittering, screaming, at times spacey dialogues. (AMG)