 In summer 1906, Nielsen joined Eleonora Duse and Emma Calvé in a joint program of related operas and dramas to open the Shuberts' Waldorf Theatre.One night Duse would act "Camille", the next evening Nielsen would sing "Traviata".That fall, Nielsen toured America with the SCOC presenting opera concerts featuring a shortened version of Donizetti's "Don Pasquale".