Sir Paul McCartney is set to perform with the surviving members of grunge band Nirvana at the 12.12.12 benefit concert in New York tonight.
The appearance comes after Paul had earlier phoned Dave, who had invited him to ''jam with some mates'' in the studio, only for them to be joined by bass player Krist and touring guitarist Pat Smear, who were in Nirvana with singer Kurt Cobain until his suicide in 1994.
Speaking of his collaboration, Paul told The Sun newspaper: ''I didn't really know who they were. They are saying how good it is to be back together. I said 'Whoa? You guys haven't played together for all that time?
''And somebody whispered to me 'That's Nirvana. You're Kurt.' I couldn't believe it.''
It has not been confirmed if Paul, 70, and the Nirvana members will play one of the 'Smells Like Teen Spirit' band's iconic songs or a Beatles track, but they are thought to be debuting a new song they have written together.
Funds raised from the show will benefit people in the Caribbean and US who have been stricken by Hurricane Sandy in October.