Patti Smith forgets lines while performing Bob Dylan Nobel tribute

Patti Smith has given a stumbling performance of Bob Dylan's A Hard Rain's A-Gonna Fall at a gala ceremony for Nobel laureates.

The American rock star appeared either to forget the lyrics or was overcome with nerves and she apologised to the 1,500 guests at the event in Stockholm, which was marked by Dylan's absence.

"I apologise. I'm sorry, I'm so nervous," she said, asking the orchestra to start again, as the audience comforted her with applause.

Dylan, 75, is the first songwriter to be awarded the prestigious Nobel Prize in Literature for creating "new poetic expressions within the great American song tradition".