First off, it's an opera and not a musical. There's a difference. A musical is a theatrical narrative with some singing and dancing. An opera is an art form where singers and musicians perform a dramatic work. Even the ending culminates in a traditional opera house to remind you of what you are experiencing, an-opera-within-an-opera. Repo has recitative sections for plot and aria sections to show emotion, and it even has a Greek Chorus (Graverobber). It also has both tragic and comedic elements similar to the style started in the Baroque period.
I know not all of the songs are perfect, but I don't think they are terrible. They are really all different as each one is it's own little art scene. They don't really transcend into one another the way a musical would. The storyboarding connects it together and I think updates the opera, otherwise you'd be looking at 3 hours instead of an 1 1/2hr like a traditional opera to get all that backstory. Also, the characters are as fleshed out as they needed be. This is not a regular narrative and they rules are just different.
Now, I know not everyone will like Repo, just because the subject and ambience of the film seem to give it an automatic cult status. It really applies to a very specific audience. You will either hate or love this movie, there really is no middle ground. I was lucky enough to see this in the theatre and it's a whole different experience. You really feel like you're in a opera house, much different than my tiny TV at home. I also really liked the cast, I thought they all did an amazing job.
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