Oh sure, Johnny Depp looks and acts like an actual person and it's based on a Hunter S. Thompson novel, but they should have just gone ahead and called it Pirates of the Caribbean 5. It's basically what this was.
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You're thinking of Ellen Foley, Broadway star and the female vocalist on Meat Loaf's "Bat Out Of Hell." According to her Wikipedia page, she also did vocals on some Clash songs and was in a relationship with Mick Jones.