Bono had emergency back surgery and U2 is unable to play The Glastonbury Festival and has rescheduled the US tour for 2011.
Mastodon's guitarist Bill Kelliher has been diagnosed with Pancreatitis and will cancel a European tour.
Paul Gray bassist of Slipknot was found dead in his hotel room yesterday.
The Eagles have canceled two dates for Hershey and Philadelphia, PA June 14 & 15. Appearing on the bill with the Eagles were the Dixie Chicks and Keith Urban. The band's website does not give a reason for the cancellations. No one seems to be injured.