Conversation so far:
What did P.G. Wodehouse do in Broadway?
P.G Wodehouse wrote a series of Broadway musical comedies during and after the First World War.
What prompted P.G. Wodehouse to go to Broadway?
P.G. Wodehouse's old songwriting partner Jerome Kern introduced him to the writer Guy Bolton.
How many musicals did P.G. Wodehouse write?
P.G. Wodehouse was a prolific writer throughout his life, publishing more than ninety books, forty plays, two hundred short stories and other writings between 1902 and 1974
Who invited P.G. Wodehouse to Broadway?
P.G. Wodehouse's old songwriting partner Jerome Kern invited him to Broadway.

Question: What was his best success?
Self-contained rewrite: What was P.G. Wodehouse's best success?