Michael Fassbender is...FRANK SIDEBOTTOM!

Fassbender, an actor firmly set on the path less travelled, is Frank, mysterious leader of an indie band that will be doing likewise in Jon ‘The Man Who Stare At Goats’ Ronson’s story. Domhnall Gleeson joins him and his crazed band member Maggie Gyllenhaal in a tour that, on the basis of this picture alone, looks like it will combine the very best of Almost Famous and a heavy dose of peyote.
Via