Christina Aguilera
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Rockers for rent

Christina Aguilera performs at the birthday party of 84 Lumber founder Joe Hardy. (John Heller/
Robin Williams also performed at the lumber magnate’s party. (John Heller/
Jimmy Buffett got $250,000 to perform at a birthday party for former Tyco CEO Dennis Kozlowski’s wife. (Richard Drew / AP)
Many artists cite Bob Dylan’s private performance for the semi-conductor company Applied Materials a decade ago as a sea change in the perceived acceptibility of such shows. (Rogelio Solis / AP)