Robert Lopez "I Believe" from The Book of Mormon Live on Soundcheck - YouTube
Songwriter Robert Lopez won his first Tony Awards in 2004 for his hilariously irreverent "Avenue Q" score. He followed up his raunchy puppet work with the music for yet another Broadway smash hit -- "The Book of Mormon." Lopez takes a seat at the piano in the Soundcheck studio to talk about his missionary-centered musical collaboration with South Park creators Trey Parker and Matt Stone.