U2 Promise 'Glastonbury on Steroids' Performance at the 2011 Festival

U2 have gone on record to promise an explosive headlining Glastonbury show this year -- and have revealed they might go as far as "sneaking" in a few stage extras through the back door.

The band headline the Pyramid stage on Friday, June 24 at the festival and have expressed their desire to make the show big on production values.

In an interview with Q magazine (via Contactmusic) bassist Adam Clayton said the performance is going to be like "Glastonbury on steroids" as the typically laid-back, down-to-earth festival starts off with a bang.

"It's very un-Glastonbury to have a big production," he said, "but we will be sneaking a few things in through the back gate which will hopefully make the experience a little more like Glastonbury on steroids.

"We're stretching the levels of what can be done. We hope to create a mind-blowing experience that reacts well with all the other substances involved."

U2 -- who play this year after cancelling their 2010 performance due to Bono's back injury -- are joined by fellow headliners Coldplay and Beyonce, as well as bands including Queens of the Stone Age, Elbow and Primal Scream.

U2's 'Beautiful Day' Video