. "Licensee: S. Soffer\r\nEntered from Booking Ledger and New York Times review (filed with Recital Hall programs); no program available. Stated time is approximate. Personnel entered from a 1974 appearance.\r\nWORLD PREMIERE of William Bolcom's STRING QUARTET NO.9" . . . "chamber music performance" . . . "Concord String Quartet" . "1973-05-21T20:00:00"^^ . .