"I'm not used to this," says the singer. "I just want to keep on doing what I set out to do when I first came to America - give 140% every night and be the best I can be at every show. It's maddening and frustrating to realize I can't do that right now. But I'll be back."

Tickets will be honored for the new date of Wednesday, September 23. Refunds are available at point of purchase until June 19 in the event ticket holders are unable to make the new date, which will not include The Pixies as openers; a new support act will be announced.