Question: In which year was this Swedish avant-garde metal band formed, whose founding members include Johannes Bergion?
Sentence (from "Diablo Swing Orchestra"): They have released three albums: "The Butcher's Ballroom" (2006), "Sing Along Songs for the Damned & Delirious" (2009), and "Pandora's Piñata" (2012).
Relevant evidence: No