 On September 22, 1956, La Nelli created the role of Bethsheba in the American premiere of Darius Milhaud's "David", co-starring Harve Presnell, Mack Harrell, and Giorgio Tozzi, conducted by Izler Solomon, and staged by Harry Horner.It was performed at the Hollywood Bowl, as presented by the Festival of Faith and Freedom Committee of the American Association for Jewish Education.At the Teatro Colón, in 1958, she was the soprano soloist for Beethoven's Ninth Symphony, conducted by Juan José Castro.