Sir Paul McCartney recently admitted that he feels he "f**ked up" his Olympic opening ceremony performance.
The former Beatles member told NME magazine that a bell had started playing, and distracted him. It had led to a sound glitch occurring, that meant Paul was singing but so was a pre-recorded track.
He told the magazine, "During the ceremony, we had a sound glitch. We pre-recorded a playback in case all hell broke loose, but I said, 'We wanna do it live'. Well, I f***ed up basically. I was supposed to wait for a cue but I forgot.
"Why? Well, there's this bloody great bell that we didn't know about. A bloody 50-tonne bell. It was deafening. We were trying to figure out what key it was in, but it was in no key known to mankind.
"I'm supposed to start on the chord of F, so I've gotta go 'Ding, ding, ding, F, F, F'. We were live, everyone was there, the world was ready and this bloody great bell goes off.
Paul McCartney performed with Bruce Springsteen at Hyde Park in July
"And I forgot I've gotta wait for it, so I go 'Hey Jude...' and someone presses the playback. So there's me on the backing track and actual me, two of us singing."
He continued, "The drummer couldn't look at me because he was in hysterics and I was thinking, 'What have I done?' There was no stopping, it was the Olympics."
McCartney is reportedly working on a new album to follow-up from his recent collection of cover songs, 'Kisses On The Bottom'. Mark Ronson and Adele producer, Paul Epworth are reported to be working on the record.
London 2012: Olympics opening ceremony photos