Don't hold your breath waiting for Mick Jagger to lead 'Tabloid' into theaters -- after all, it's only in the script stage -- but if it does, the film will allow the Rolling Stones lead singer to add to his Hollywood resume. Good thing, too, since Jagger pales in comparison to the following world-class singers when it comes to acting careers. Ahead, nine great singers who also happen to be pretty great actors. Most of the time.
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