The group performed at the opening of the United Nations and has sung and recorded with such conductors as Serge Koussevitzky, Arturo Toscanini and Leonard Bernstein.
Bass and the chorale also recorded and performed two of Beethoven's cantatas, Der Glorreiche Augenblick and Auf die Erhebung Leopold des Zwieten zur Kaiserwürde with sopranos Deborah Voigt and Elizabeth Futral.
Notable singers who performed with the choir during these years, included Kathleen Battle, Stephanie Blythe, Vinson Cole, David Daniels, Lauren Flanigan, Maria Guleghina, Hei-Kyung Hong, Salvatore Licitra, Alessandra Marc and Bryn Terfel.
[5] In July 2007 the choir was invited to perform Brahms' Ein Deutsches Requiem at Switzerland's Verbier Festival.
[3] He has directed their staged concerts of musicals and operettas such as Song of Norway, Knickerbocker Holiday, The Pirates of Penzance, My Fair Lady, Anyone Can Whistle, The Mikado and Iolanthe, and operas such as The Grapes of Wrath[1] and Carmen.