‘Book of Mormon': Watch ‘I Believe’ Performance at the Tony Awards (Video)

Star Andrew Rannells belts out a key track before the production wins Best Musical

"The Book of Mormon" — the Broadway production from the minds behind "South Park" and "Avenue Q" — was a big winner Sunday night, raking in nine Tony Awards.

The satirical production is so beloved, in fact, that comedian Chris Rock introduced the Best Musical category by quipping, "We know what the best musical is. This is such a waste of time. It's like taking a hooker to dinner."

Also read: Tonys: The Complete List of Winners

Not long before "The Book of Mormon" scored the top musical prize at the ceremony, star Andrew Rannells unleashed the song "I Believe." We believe it is hilarious.