Conversation so far:
What did P.
G.
Wodehouse do in Broadway?
Wodehouse "the most observant, literate, and witty lyricist of his day".
What prompted him to go to Broadway?
they thought the song lyrics weak and invited Wodehouse to join them on its successor.
How many musicals did he write?
CANNOTANSWER.

Question: Who invited him to Broadway?
Self-contained rewrite: Who invited P. G. Wodehouse to Broadway?