Jason Mraz is no stranger to Sara Bareilles's musical Waitress. After all, he joined the Tony-nominated singer-songwriter for duets on her Waitress concept album, What's Inside. But now, Mraz is venturing where he's never ventured before: Broadway. The Grammy winner will play Dr. Pomatter to Betsy Wolfe's Jenna for 10 weeks beginning November 3. At a recent press preview of his engagement, Mraz told us what it's like to play someone other than himself onstage for once — and why he's looking forward to it.