Musical Producers was played on the British version of Whose Line.
Much like Greatest Hits, Musical Producers featured two performers (often Paul Merton and/or Sandi Toksvig), who were brainstorming the next great musical. The other two performers (often Mike McShane and/or Josie Lawrence) sing scenes from the musical, as the producers come up with it. Clive Anderson got the title of the musical from the audience.
The first playing of the game was in the Christmas special of 1989. Since there were six performers, the game was a little different. For that playing, Clive went to the audience and got several scenic suggestions. This was very similiar to the game, American Musical.