Variations 

As isn't surprising with something that's been absorbed into the cultural subconscious, there are a lot of musical versions of The Phantom of the Opera as well as all the print and stage versions.  While they usually aren't quite as cohesive in terms of story, it's extremely interesting to see what musical ideas such a fundamentally music-driven story inspires, and which previous incarnations of the story are most prevalent as influences.  Just for fun, here are a few musical variations from different sources; check them out, and draw your own conclusions.