Rockers Aerosmith have canceled their Let Rock Rule tour date on August 13th after an unexplained illness of drummer Joey Kramer. They were set to play in Concord, California. More dates can be cancelled even though that is not official yet.

"The band regrets not being able to perform for their fans," a message at Aerosmith's official website says, before directing ticketholders to refund sites.

TMZ is reporting that heart problems are to blame. They say a member of the Aerosmith crew revealed the 64-year-old drummer will need surgery ? though that's unconfirmed.

Source:	aerosmith.com
Band profile:	Aerosmith