Writer/director Joss Whedon has proven himself a one-man cult hit TV series machine (Buffy, Firefly, et al.), viral web producer (Dr. Horrible’s Sing-Along Blog), and successful comic book film director (Avengers), but now he’s set to tackle a new arena: film scoring. Speaking at Comic-Con over the weekend, Whedon revealed that he penned the music for his next film, an adaptation of Shakespeare’s Much Ado About Nothing. This is his first foray into scoring a feature, and it was “terrifying,” he said. “When I’m terrified, I know I’m having fun.” It isn’t Whedon’s first attempt at original music, however, as the aforementioned Neil Patrick Harris-starring online show featured both comedic compositions in the series and an unprecedented original score for the DVD commentary. Below, check out Whedon’s debut public singing performance, “Return To The Scene Of The Crime,” live on This American Life: