In this episode, guest mentor Josh Groban was left in awe after witnessing contestant Amanda Barise perform onstage. She hit the stage barefoot and sang a cover of Defying Gravity from Wicked movie.

Tune in to Good Morning America this Friday, May 2, to watch a performance from Tony-nominee Josh Groban! The Broadway alum ...

To celebrate the release of his new retrospective album 'Gems', Tony-nominee and bestselling singer Josh Groban visited Good ...