Andrew Watt has built a stellar roster of collaborators, with British legend Paul McCartney firmly on that list. On August 20, the Beatles bassist joined Watt and Red Hot Chili Peppers drummer Chad Smith on stage at the 250-capacity Stephen Talkhouse in the Hamptons, for a raucous rendition of The Beatles’ and Neil Young’s . McCartney joined the show mid-set, to the audience's surprise and delight.

He immediately commanded the stage and led the band, which, in addition to Watt on guitar and Smith on drums, also included Saturday Night Live band member and seasoned session guitarist G.E. Smith, along with a horn section.

Watt's girlfriend, singer-songwriter and model Charlotte Lawrence, also joined McCartney on vocals during . Prior to this impromptu performance, playing bass on the track In a profile, the producer also revealed that he had written an as-yet-unreleased song with McCartney, which came about over a cup of tea. “He’s very resourceful,” McCartney said.

“I said, ‘I’d like to show you something on guitar, but I haven’t got my guitar with me. And he said, ‘I’ve got a guitar.’ And I said, ‘Yeah, but I’m left-handed.

’ He said, ‘Well, I’ve got a left-handed guitar.’” After a jamming session, McCartney returned to the studio with lyrics and a vocal line. “Suddenly, we had a song.

From a cup of tea to a song. Doesn’t it sound easy?” Watt recently worked on Iggy Pop's 19th studio album, , Pearl Jam's , Lana Del Rey and Quavo’s .