Conversation so far:
When did Sophie Tucker first take the stage?
In 1907, Sophie Tucker made her first theater appearance.
In what 1907 performance did Sophie Tucker perform in for her first theater appearance?
Sophie Tucker was singing at an amateur night in a vaudeville establishment in 1907.
Are there any other interesting aspects about Sophie Tucker stage career besides her first appearance?
Sophie Tucker began integrating fat girl humor, which became a common thread in her acts.

Question: What song was that?
Self-contained rewrite: What songs did Sophie Tucker include in her fat girl humor?