The Beatles legend is still rocking well into his 70s and loves playing live, but he has now revealed his biggest buzz during concerts is the audience's reaction to a howling error.

He tells the London Evening Standard, "I used to be terrified, as are most entertainers, of making a mistake. Now I realise the audiences don't mind. In fact - they quite like it. You get these little eureka moments - you make a mistake and go, 'S**t! Christ!'

"I did one a few years ago in Paris when George Martin and Cilla Black were visiting. I started Penny Lane with the wrong verse and I had to stop the song and start again. We ground to a halt and the audience went mad! They enjoyed it and I said, 'At least it proves we're live!' The review said it was the most marvellous bit.

"These little things contribute to your understanding of what you're doing. People say why do you still do it - because of moments like that - it feels good!"

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