John Fogerty joined Billy Joel on stage on Thursday night (March 21st) during the "Piano Man's" month performance at New York's Madison Square Garden. Fogerty hopped on stage playing a sunburst Les Paul and ran through a pair of his Creedence Clearwater Revival classics -- "Up Around The Bend" and "Fortunate Son."

Over the years Billy Joel has welcomed numerous guests onstage during his monthly Garden shows, including Bruce Springsteen, John Mellencamp, AC/DC's Brian Johnson, Foreigner's Mick Jones and Lou Gramm, Paul Simon, Patty Smyth, Chick Corea, Bryan Adams, John Mayer, the Rascals' Felix Cavaliere, Miley Cyrus, Richie Sambora, Steve Miller, and Sting.

Last week, Fogerty announced that he would be among the performers this summer at Woodstock 50 -- along with such veterans of the original event as David Crosby, Santana, Dead & Company, Hot Tuna, John Sebastian, Melanie, and Country Joe McDonald, among others.

John Fogerty recently explained to us that when the muse and the groove come together -- like it did for "Fortunate Son" -- it's an almost otherworldly experience: "It was just the happiest of things that that first line was 'Some folks are born. . . ' -- and then I said something. That gave me a way of accessing the next thought in the next verse. Where did that come from? I don't know. And I didn't know it was comin.' But, the fact that it did that afternoon when I did that, for 'Fortunate Son,' it meant that I was just flyin'! All the stuff just changed. That one took about 20 minutes."

AUDIO: JOHN FOGERTY ON WRITING 'FORTUNATE SON'