Talk show host Jimmy Fallon is clearly a fan of Broadway's newest hit, The Book of Mormon. On May 24 the musical's Tony-nominated star Andrew Rannells sat down on the funnyman's couch and could barely get a word in as Fallon, who's seen Mormon twice already, showered the actor with praise. Fallon loves the high notes Rannells hits in "Hello" (the show's opening number) so much that he invited Rannells, fellow guest Ed Helms of The Office and The Hangover Part 2 and onstage band The Roots to a competition to see whose voice could deliver the highest notes. Did Rannells prevail? Take a look below to watch the Broadway star show off some impressive singing skills.