Video: Paul McCartney Sits in With Local Band

Famed musician joined a band performing at his stepson's graduation party.

ByABC News

May 12, 2015, 5:56 PM

 -- Josh Walther and the band Phase5 got the "thrill of a lifetime" when Sir Paul McCartney joined the band on stage to perform at his stepson's graduation party.

It all started when the band, which plays R&B, rock and funk at everything from charity functions to weddings, booked a gig at Rollins College in Winter Park, Florida, last Saturday.

The person doing the booking seemed to know a lot about amps and instruments. Turns out, it was Nancy Shevell, McCartney's wife.

Kanye West's New Song Bringing Up the Question Who Is Paul McCartney?/><p>The party, she said, was for her son, who was graduating from Rollins College, and Sir Paul would be there, Walther told the ABC affiliate in nearby Tampa Bay.</p>Not only was the former Beatle there, he led folks on the dance floor.<p>"We were really excited that he was the first person on the dance floor and remained there for our entire two-hour show," the band wrote on Facebook.</p>But that wasn't all."Nothing would prepare us for the moment when he asked if he could sing a few with us!" the band wrote, calling it the "thrill of a lifetime."McCartney joined the group in a performance of "I Saw Her Standing There.""More than anything I feel really lucky that it happened," Walther told ABC affiliate WFTS.Check out the video below:<script>(function(d, s, id) { var js, fjs = d.getElementsByTagName(s)[0