"Serkin and Busch prepared Busoni’s second violin sonata for performance. Busoni gave them an audience and was pleased with their performance. (He told Serkin he was too old for lessons, but that he should attend as many concerts as possible and play with more pedal.) Shortly afterward, Serkin and Busch heard Busoni and Egon Petri play the same piece (on November 16, 1921 in the Beethoven-Saal, in an arrangement for two pianos) at twice their tempo."