Conversation so far:
What did George M. Cohan do first?
George M. Cohan began his career as a child, performing with his parents and sister in a vaudeville act known as The Four Cohans.
How many skits did George M. Cohan write?
George M. Cohan began writing over 150 original skits and songs.

Question: Who did he write these for?
Self-contained rewrite: Who did George M. Cohan write these for?