Paul McCartney shared the stage with local bandPhase5 at the graduation party of Arlen Shevell, the son of his wife Nancy.

Band leader Josh Walther told Examiner that McCartney began the evening on the dance floor, and during the band's break, he asked if he could sit in.

"He had us play a blues progression and he improvised a song about his stepson's graduation," Walther said. "And then we did "I Saw Her Standing There."

We went through basically the whole catalog of Beatles songs we knew and he really wanted to do "[I] Saw Her Standing There," but we had never played it.

Our piano player pulled up a chart off the internet and we just totally winged it. It turned out great."

He added that Sir Paul "was really complimentary of the band" and was a "super nice guy and very unassuming.

He seemed to want to hang out more with us, but his wife wouldn't have it. He told me I had the smoothest voice."