If Jessie Mueller were a song, she’d be No. One with a bullet. A not inappropriate way to refer to the actress who has been chosen to play singer/songwriter and pop immortal Carole King in the new Broadway musical, Beautiful, now in previews for a Jan. 12 opening night. Beautiful, indeed. Just two years ago this month, Mueller made her Broadway debut in the revival of On a Clear Day You Can See Forever, earning a Tony Award nomination for Best Performance by an Actress in a Featured Role in a Musical. Two shows later (Nice Work If You Can Get It and The Mystery of Edwin Drood), and her name is above the title. What have these roller-coaster two years been like? "I have to pinch myself from time to time," she says in the following interview.