Conversation so far:
What are Rudolf Friml's greatest successes?
Rudolf Friml's best-known works are Rose-Marie and The Vagabond King.
Did Friml's works Rose-Marie and The Vagabond King do well for him?
Rose-Marie and The Vagabond King enjoyed success on Broadway and in London and were adapted for film.
What was interesting about the operetta Rose Marie?
Rose Marie was a hit worldwide. The use of murder as part of the plot was ground-breaking among operettas and musical theatre pieces at the time.

Question: What did he write next?
Self-contained rewrite: What did Friml write next after Rose Marie?