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LONDON (AP) _ Rock wild man Ozzy Osbourne promised to behave himself at Queen Elizabeth II's Golden Jubilee pop concert.

``I don't want to spend the rest of my life in the Tower,'' the former Black Sabbath star told the national news agency Press Association before he performed Monday night. ``I mustn't drop my trousers, no bad language or perhaps a trap door will open.''

The 53-year-old heavy metal icon, who found new fame with the MTV reality series ``The Osbournes,'' once was notorious for having bitten the head off a bat during a 1982 concert. But the much tamer concert at Buckingham Palace was the highlight of his career, he said.

``Absolutely, this means more to me than anything. These last six months, I've had such good fortune land my way,'' he said. ``I keep thinking that sooner or later the bubble will burst. My wife, Sharon, keeps saying, 'You're one of those guys who's not happy unless you find a dark cloud.'''

Osbourne said he thought it was a joke when he heard he'd been invited to play at the palace.

``I'm more surprised than anybody else that I'm here. My wife told me and I thought, 'You're pulling my leg.' Heavy metal at the palace? I'm not sure whether the queen is a fan, but obviously she must be.''

Also on the lineup for the show, celebrating Queen Elizabeth II's 50 years on the throne, were Paul McCartney, Eric Clapton and Phil Collins.