Steve Martin and his five-string banjo will perform as Adam Lambert and Kris Allen faceoff for the title of “American Idol 2009″ on the American Idol Season Finale Wednesday night.

The Grammy/Emmy-winning comedy legend — and self-proclaimed “Wild & Crazy Guy” — will perform an original song from his new album, The Crow: New Songs for the Five-Sting Banjo (Rounder) , in stores Tuesday. goes on sale today!