Former Beatle Paul McCartney is set to take Kurt Kobain’s place during Nirvana's reunion performance tonight.
Mr McCartney will join Foo Fighters front man Dave Grohl and bassist Krist Novoselic, who have not been on stage together for 20 years.
The union came about after Mr Grohl invited Mr McCartney to join his former band mates. Since then they have been working in secret and will perform a new song tonight.
McCartney 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."
The band will also be joined by guitarist Pat Smear, who performed alongside Nirvana during their final six months.
The 12-12-12 concert, in aid of Superstorm Sandy victims, will also see Bruce Springsteen, The Rolling Stones, Bon Jovi and The Who performing in Madison Square Gardens.
It will be streamed live online from 12.30am GMT and will be available for up to 2 billion people.
