. "Entered from booking ledger and New York Times concert listing and review. The musicians included an unidentified violinist and a \"sizable percussion ensemble\" performing Harold Seletsky's \"Apathy\".\r\n\"Who Makes Music, Where and when: METROPOLITAN OPERA OTHER EVENTS.\" New York Times (1923-), Feb 06 1966, p. 1. ProQuest. Web. 26 Aug. 2024.\r\n\"2 Composers Offer their Own Works at a Concert here.\" New York Times (1923-), Feb 08 1966, p. 34. ProQuest. Web. 26 Aug. 2024." . . . . "Concert of Works by Harold Branch and Harold Seletsky" . . . . . "1966-02-07T20:30:00"^^ . . "chamber music performance" . .