Tom Waits took the stage unannounced to help Mick Jagger sing 'Little Red Rooster' during Sunday night's Rolling Stones concert in Oakland, Calif. The rarely-seen singer/songwriter was in top form trading verses with Jagger. It's rare someone steals the spotlight from the legendary frontman, but that's what took place at the Oracle Arena.

The performance feels spontaneous and mostly unrehearsed as they miss a few cues to reenter and work out who is going to sing which phrases on the fly. Waits spends most of his non-singing time doubled-over, as is his style, while Jagger puts an arm on his mic stand to watch as Waits howls along.

Waits and Stones' guitarist Keith Richards are good friends, with Richards helping on Waits new solo album, 'Bad as Me.' The two also teamed up recently to sing the traditional folk song 'Shenandoah' on 'Son of Rogue's Gallery: Pirate Ballads, Sea Songs and Chantey's,' an album partly compiled by actor Johnny Depp.