Photo by Skip Bolen/Getty Images for Blackbird Productions

After his set Saturday afternoon at Jazz Fest in New Orleans, Bruce Springsteen headed crosstown to the Saneger Theatre where he was the surprise guest at The Musical Mojo of Dr. John: A Celebration of Mac & His Music. No stranger to the Doctor, who sat in with Bruce and the E Street Band at last year's Jazz Fest, he kicked off the tribute with a version of "Right Place Wrong Time," trading vocals with the man himself.