In 1926, he returned to America after notable European successes. He began an engagement at the Roxy Theatre in New York, opening the theater in March 1927, as music director of its 110-player Roxy Symphony Orchestra. (At the time this was world's largest permanent orchestra, outnumbering the New York Philharmonic by three musicians). Millions of listeners heard his symphonic concerts over the air on Sunday afternoon during "The Roxy Hour" radio broadcasts, and he also conducted for the "General Motors Concerts".