Keeping tabs on Las Vegas headliners and Strip residencies

Britney isn't the only superstar winding down a big Vegas show. Elton John began his first residency, “The Red Piano,” at the Colosseum at Caesars Palace in 2004, and followed it up with the more critically acclaimed “The Million Dollar Piano” in 2011. He'll finish the show on May 19. With Mariah Carey …
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