Casals master class. Flanked by a lustrous spouse, who with the muscular tenderness rises occasionally to tune her husband's instrument, the Maestro attends young cellists during a heat wave. Boys don't interest him, yet to one bonnie lass (Sharon Robinson) he suggests with a chuckle, "Play more like a man." (Subdued hisses.) To pianists - the "accompanists" - not one word, as though Schumann's keyboard were a mere backdrop.