Multi-talented Johnny Depp made a special appearance at Alice Cooper's Rock n' Roll Hall of Fame concert Sunday night!

The show, at London's 100 Club, featured Depp playing Cooper's greatest hits, including "School's Out." He even did a solo riff! Depp, a longtime guitar player, was actually a musician before he got into acting. Buddy Nicolas Cage discovered him playing guitar and told me he should branch out!

We loved seeing Johnny sing in movies like Sweeney Todd -- now we want to see him play a rocker! He certainly looks the part.

See what famous band Johnny played guitar for -- and watch more video of his Sunday night performance -- after the jump!