WORKS takes a look at Gary Burton's projects for ECM during several productive years in the mid-'70s. On the albums from which these tracks were culled, Burton didn't explore material as far-flung as that recorded in his prior years with RCA. That earlier period yielded tangos with Astor Piazzolla, country outings with Nashville players, and a "dark opera without words" composed for him by Carla Bley. But within the chamber jazz context that he did pursue, his breadth and varied approaches are quite bracing.