08/01/2010 05:12 am ET Updated May 25, 2011

John Mayer Sick: Mystery Illness Forces Cancellation Of European Shows

John Mayer is waiting on his health to change before going back onstage.

The garrulous pop star has pulled the plug on the remainder of his shows in Europe and will be returning to the U.S. to recover from an undisclosed illness which caused him to cancel last night's concert in Copenhagen.

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