Conversation so far:
What was one of the theatres where John Barrowman performed?
Prince Edward Theatre
What role did John Barrowman play at the Prince Edward Theatre?
Billy Crocker in Cole Porter's Anything Goes
What year was Cole Porter's Anything Goes at the Prince Edward Theatre with John Barrowman as Billy Crocker?
1989

Question: What other roles did he play?
Self-contained rewrite: What other theatre roles did John Barrowman play other than Bill Crocker in Cole Porter's Anything Goes?