Of course they also fall in love. Of course they have heartfelt conversations while standing behind the "Hollywood" sign. Of course they break up because of a tragic misunderstanding. Of course their mistake is repaired and (spoiler!) they're back together at the end. Has ever a romance in a musical been otherwise?

They're sweet and likable, but for me, the better story involves the fate of the club, the Bourbon Room. Dennis Dupree (Alec Baldwin), its owner, is desperate because he owes back taxes and will have to close the doors at any moment. His only confidante is a weathered rocker named Lonny (Russell Brand), whose primary function is to lean over him during phone calls and frantically tell him what to say. The person on the other end of the line is usually a venal music manager named Paul Gill (Paul Giamatti), who claims he will save the club by supplying his legendary client Stacee Jaxx (Tom Cruise) for a one-night farewell concert.

If you're tracking those names, you're perhaps impressed. Adam Shankman's "Rock of Ages" not only has a high-profile cast, but they never seem to be slumming; they play their roles with great intensity and earnestness, which is really the only way to do satire.

A subplot is recycled directly out of old "Beach Party" musicals. If you are of a certain age, you may remember them. Frankie, Annette and the gang were always having a great time down at the beach when some stuffy local politician decided to run them out of town as a campaign tactic. In this case, the politician is Mayor Whitman (Bryan Cranston), who gets all of his instructions from his domineering wife, Patricia (Catherine Zeta-Jones). She leads a group of protesters across the street from the Bourbon Room, while Dennis and Lonny look grimly out the window.

There isn't an original idea in the screenplay by Justin Theroux and Chris D'Arienzo, based on an Off-Broadway hit. Even the songs are oldies. And that's OK, because the actors are having a lot of fun, and the production values of the musical numbers are slick and high-spirited. The only problem is that the plot meanders when nobody is singing. If you're making the kind of movie where everybody in the audience knows for sure what's going to happen, it's best not to linger on the recycled bits. If Drew misunderstands something he sees and thinks Sherrie was cheating on him with Stacee Jaxx, then let them clear that up without a lugubrious return visit to the Hollywood sign.

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