Entered from booking ledger and New York Times concert listing and review. The review indicates that the Wuorinen, Shifrin, and Babbitt works were each performed twice. The clarinetist and cellist are not identified (possibly Laura Flax and Andre Emelianoff?). Patricia Spencer is identified in the ledger as the licensee, and since Joel Lester and Joan Tower were founding members of the ensemble, they have been included on this record as well. "Who Makes Music and Where." New York Times (1923-), 11 Oct. 1970, p. 124. ProQuest. Web. 7 Aug. 2025. Davis, Peter G. "DA CAPO PRESENTS 7 MODERN WORKS: PERFORMS 3 PIECES TWICE-- WEBERN AND BABBITT GIVEN." New York Times (1923-), 18 Oct. 1970, p. 94. ProQuest. Web. 7 Aug. 2025.