Recorded in ’69, Greek Variations & Other Aegean Exercises is irresistible on two counts. First, for its daringly conceived and brilliantly performed music, inspired by Greek folk songs and instrumental textures and deep enough to reveal all its treasures only after many repeated listenings. Second, for being recorded at the moment when the Don Rendell/Ian Carr Quintet, a major force in British straight-ahead jazz since ’62, had broken up and Carr’s equally influential jazz-rock band Nucleus was rising from the ashes.