Totally missing the point with The Producers. In the movie the "Springtime for Hitler" play becomes an (unplanned) success. And the movie itself became a success, showing that you can indeed "mix oil with water" with enough audacity. The article presents it like it is obvious that Hamlet or Lolita will never work as a musical - presumably because the material is too serious for showtunes - but Jesus Christ Superstar was a huge success.