erza was a featured singer with the pasdeloup orchestra in paris under rhené-baton, and spent three seasons with the concerts classiques of monte carlo. in 1921 she sang at a concert to benefit a french village, misery-sur-somme, after world war i. she made her "formal debut" in america at the aeolian hall in new york city in 1922, and had another new york concert billed as a "debut" in 1930, at the biltmore theatre. "the new york times" called her "a well-schooled musician with a flair for the exotic" in 1931. she sang at carnegie hall later that year, sharing the stage with hugh ross and the chorus of the schola cantorum, nelson eddy, and others, for the american premiere of karol szymanowski's "stabat mater".