Conversation so far:
When was Rhapsody in Blue started?
Rhapsody in Blue is a 1924 musical composition by the American composer George Gershwin.
Who started the musical, Rhapsody in Blue?
At Aeolian Hall in New York City on November 1, 1923, the bandleader Paul Whiteman decided to attempt something more ambitious.

Question: How many people were in his band?
Self-contained rewrite: How many people were in Paul Whiteman's band?