"Amy Winehouse just whispered to me, 'I know I'm not on the lineup but do you mind if I play?' Obviously I wasn't going to say no and she got up and played and it was amazing," the Daily Star quoted Organiser Izzy Lawrence as saying.
Amy Winehouse, the 27-year-old, belted out six songs, including Tears Dry On Their Own and a number of new tracks - and the previously unheard material was well received.
“It's quite upbeat, quite funky, very soulful. I think this is going to be massive. If those songs are going to be on the new album, it's going to be huge," Lawrence added.