Johnny Depp is featured on the cover of the latest issue of Rolling Stone for an article titled "Johnny Sings." In an in-depth interview, the Sweeney Todd star talks to writer Gavin Edwards about his rock 'n' roll roots and the challenges and rewards of tackling the Stephen Sondheim masterpiece:

Sondheim has incredibly beautiful melodies, and what goes along with those melodies are sometimes dissonant, supercomplex chord arrangements that actually shouldn't make sense. They shouldn't go together, but they do somehow, because he's a genius. Doing that music, it becomes emotional organically ... It's build into Sondheim's stuff.

You can find an excerpt of the interview at rollingstone.com, and you can read the complete interview in the January 24 issue of Rolling Stone magazine, on newsstands now.

The Sweeney Todd soundtrack is available now in the Nonesuch Store.