Billy Joel welcomed Jason Bonham on stage during his Friday night show (May 24th) at Philly's Citizens Bank Park. The band ran through a pair of Led Zeppelin classics, with Billy's soundalike guitarist Mike DelGuidice fronting the band on "Whole Lotta Love" and "Good Times Bad Times."

Other highlights in the show included a Memorial Day nod to the fallen servicemen with "Goodnight Saigon," the 1989 Storm Front favorite, "I Go To Extremes" -- and Billy's first performance of "Captain Jack" in a couple of years. The song and Philadelphia are intertwined, seeing as how it was Philly radio that broke the song -- and Billy's career -- by turning a live broadcast of the tune into a regional hit before it was officially released in 1973.

Jason Bonham admits that like many fans, through the years he's sought to better understand his late-father John Bonham through Zeppelin's catalogue: "I've always been a fan. It is the first and foremost thing. Y'know, after losing dad at 14, you pick up the albums and want to know everything about my father I should have asked when he was alive."

Billy Joel told us that the reason why he and his band are able to tackle anything from his back catalogue onstage and beyond is because while making their bones, everybody had to play covers during their early club days: "Everybody in my band -- and me included -- was in a bar band at one time. And we had to play the top hits of the day, from 'Woolly Bully,' to the Rascals, to James Brown, to the Beatles -- you name it; we had to play it. And we liked playing all different kinds of music, because we were capable of playing different kinds of music."

AUDIO: BILLY JOEL ON MUSICAL DIVERSITY
AUDIO: JASON BONHAM ON BEING A LED ZEPPELIN FAN