See Johnny Depp Play a Weepy Solo on Danzig's 'Mother' With Ryan Adams

The actor also played the Adams original "Kim" as part of the evening's encore

Johnny Depp got a rousing "Johnny! Johnny! Johnny!" chant Thursday night after making a surprise appearance at Ryan Adams' London concert where they played Danzig's anti-PMRC screed "Mother" as an encore song.

At the 2,000-person-capacity O2 Shepherd's Bush Empire venue, the actor donned his usual wide-brimmed cap for the occasion and opted to play his own weepy, bluesy guitar lead instead of the pyrotechnic solo on the original. Depp also stuck around to close out the show, playing guitar on Adams' unrequited love song "Kim," off his recently released Ryan Adams album.

Depp has been particularly busy in the music realm in recent years. Earlier this month, video of a half-hour blues jam he had with Paul McCartney came out. A month before that, news broke that he had sat in for Elvis Costello to play guitar on the song "Kansas City" during the sessions for Lost on the River: The New Basement Tapes, a collection of previously unreleased lyrics that Bob Dylan wrote while making his legendary Basement Tapes. And in July, Depp joined Aerosmith onstage at two different concerts to play on covers of "Train Kept-a-Rollin'" and "Big Ten Inch Record." Over the past few years, Depp has joined Willie Nelson, the Black Keys, Alice Cooper and Marilyn Manson to play guitar.

Adams has been busy lately, too. In addition to working on his new record, the singer-songwriter has produced sessions for Fall Out Boy and Jenny Lewis. He's also been collaborating with actors other than Depp, drafting the "Mistress of the Dark," Elvira, for his "Gimme Something Good" video and comedians Garry Shandling and Jeff Garlin for promo videos.