Conversation so far:
What was The Firefly?
The Firefly was the first operetta written by composer Rudolf Friml, with a libretto by Otto Harbach.
What was Rudolf Friml's first theatrical success?
After a month of work, Rudolf Friml produced the score for The Firefly which became his first theatrical success.
What was Rudolf Friml's operetta, The Firefly, about?
The Firefly is about a young Italian street singer in NY who disguises herself as a cabin boy on a ship to Bermuda. She eventually becomes a grand opera diva.
Are there any other interesting aspects about the Rudolf Friml's article?
Emma Trentini was named as a co-respondent in Rudolf Friml's divorce from his first wife in 1915, and evidence was introduced that they were having an affair.

Question: Why did he look for another composer?
Self-contained rewrite: Why did Arthur Hammerstein look for another composer other than Victor Herbert?