Smashing Pumpkins singer, Billy Corgan is testing out the classic rock 'waters.'  Literally. Corgan joined Pink Floyd bassist Roger Waters on stage Friday in Washington, D.C. for the Music Heals benefit concert. 

Corgan and Rage Against the Machine's Tom Morello both did "Comfortably Numb" with Waters and then Corgan later came back for "Brain Damage/Eclipse," "Wish You Were Here" and a cover of Bob Dylan's "Forever Young."  Morello also joined Waters again for "Shine On You Crazy Diamond" and "Money," plus a cover of Bruce Springsteen's "The Ghost of Tom Joad." 

The Music Heals benefit raises money for MusiCorps, a non-profit organization that supports injured soldiers and their families.