Conversation so far:
What was one of the theatres where John Barrowman performed?
Prince Edward Theatre.
What role did he play?
Billy Crocker in Cole Porter's Anything Goes.
What year was that?
1989.
What other roles did he play?
He continued to appear in West End productions for the next decade, taking the title role of Domingo Hernandez in Matador.

Question: Did he work at other theatres?
Self-contained rewrite: Besides Prince Edward Theatre, did John Barrowman work at other theatres?