I wrote about Serkin and his gigantic encore, here are the details: 1921, Serkin gave a Bach concert with Busch (violin). At the end, Busch pushed him out, telling him to play an encore. "What shall I play?" asked Serkin. "The Goldberg Variations," answered Busch, jokingly. Serkin took him seriously. He says that when he finished, there were only four people in the audience -- Busch, Schnabel, Alfred Einstein, and himself." From 'The Great Pianist's: From Mozart to the Present', Schonberg, pp. 452 JPrevite