Due to illness,AEROSMITHhas been forced to cancel tonight's (Wednesday, August 13) performance at the Concord Pavilion in Concord, California. The band regrets not being able to perform for its fans. Refunds will be available at point of purchase.

According toTMZ.com,AEROSMITHdrummerJoey Kramerexperienced heart complications Tuesday and the band plans to cancel its next show in Washington on Saturday (August 16) as well.

A source close to the band told the site the 64-year-old musician will undergo heart surgery, although this has not been confirmed. The drummer has reportedly had previous issues with his heart.

AEROSMITH's"Let Rock Rule"tour with opening actSLASH FEATURING MYLES KENNEDY AND THE CONSPIRATORSis scheduled to run through September 12 atCape Fest 2014in Nova Scotia, Canada.

Kramer's autobiography,"Hit Hard: A Story Of Hitting Rock Bottom At The Top", was released on June 30, 2009 throughHarperCollins. In the book,Kramer, a founding member and drummer ofAEROSMITH, courageously told the world how he has wrestled with depression as part of the most successful rock band in American history.

In 1997, amidstAEROSMITH's sold-out world tour and No. 1 album release,Joeyrevealed in an interview his ongoing struggles with depression. The response from fans and people battling those same internal demons was overwhelming.Joey- who has been the drummer in aerosmith since it was founded in 1970 and was the first member of the band to release his own book - told the complete story: the early days of the band, glamorous drug-addled events leading up to their eventual sobriety, battles within his family and among bandmates, and the explosive internal dynamics inAEROSMITHthat continue to unleash a fury of endless creativity.