WATCH: Josh Groban, Kelly Clarkson Duet on "All I Ask of You" from 'Phantom' >>

Josh Groban and Kelly Clarkson are made for each other in their cover of "All I Ask of You" from 'The Phantom of the Opera'. Say what you will about Andrew Lloyd Webber, this PBS performance is worth a few listens. The performance initially saw light on Groban's latest album 'Stages'. He and Clarkson performed the 'Phantom' hit with ease, with Clarkson venturing into a new area with her voice.