. "chamber music performance" . "1961-05-11T20:30:00"^^ . . "Entered from booking ledger and New York Times concert listing and review. The members of the chamber ensemble are not identified.\r\nWORLD PREMIERE of William Sydeman's 7 MOVEMENTS FOR SEPTET\r\nWORLD PREMIERE of William Mayer's ONE CHRISTMAS LONG AGO (excerpts)\r\n\"CONCERT AND OPERA PROGRAMS THIS WEEK.\" New York Times (1923-), May 07 1961, p. 1. ProQuest. Web. 5 Oct. 2022.\r\nEricson, Raymond. \"Mayer and Sydeman.\" New York Times (1923-), May 12 1961, p. 21. ProQuest. Web. 7 Oct. 2022." . . "Concert of Vocal and Chamber Music by William Sydeman and William Mayer" . . . . . . .