Paul McCartney and the surviving members of Nirvana have played together before, but the most recent reunion was extra special: it was in Seattle -- the city which catapulted the unlikely rock stars to global success and the forefront of the so-called grunge movement in the early '90s. Dave Grohl, Krist Novoselic and Pat Smear joined the former Beatle onstage at Safeco Field for five songs during his encore on Friday July 19.

The Nirvana alumni had only performed together in Seattle once before after frontman Kurt Cobain’s death in 1994 and that was 15-plus years ago.

McCartney brought the three musicians out onstage for Concert for Sandy Relief in New York last December to play on ‘Cut Me Some Slack,’ the song they recorded together for Grohl’s 'Sound City' documentary. McCartney told Rolling Stone it was his idea for them to reunite again at his concert.

"We hatched that plan a couple of weeks ago," McCartney said. "Dave was going to come up to Seattle with his family, and I said to him, 'Do you think there's any chance the guys would fancy [a reunion]?' He said, 'Well, let me ask.' And they fancied it. So we thought, 'Let's go and flip 'em out.'"

During the encore, they revisited ‘Cut Me Some Slack’ and continued to jam with Sir Paul on the Beatles hits 'Get Back,' 'Helter Skelter' and 'The End' and Little Richard's 'Long Tall Sally.’

Watch Paul McCartney and Nirvana Alumni on 'Helter Skelter' 

Watch Paul McCartney and Nirvana Alumni on 'Get Back'