In 1919, when Yon was married to Francesca Pesagno, the organist for the occasion was one of Yon's newest friends, the Belgian-American virtuoso Charles M. Courboin who had been chosen to rededicate the Wanamaker Organ in Philadelphia, now enlarged to 17,000 pipes and still the largest operational organ in the world. In 1920, Yon would share the stage at Wanamaker's with Courboin, Leopold Stokowski, and the Philadelphia Orchestra in one of the gala organ recitals performed at the store through the 1920s.