Entered from booking ledger and New York Times concert listing and review. "CONCERT AND OPERA PROGRAMS THIS WEEK." New York Times (1923-Current file), May 14 1961, p. 1. ProQuest. Web. 23 Oct. 2019. "ALBERTS VECINS SINGS: LATVIAN SONGS AND FAMILIAR WORKS OFFERED BY TENOR." New York Times (1923-Current file), May 20 1961, p. 13. ProQuest. Web. 23 Oct. 2019.