Diablo Swing Orchestra, also shortened DSO, is a Swedish avant-garde metal band formed in 2003. They are known for having an eclectic sound, which fuses swing music with symphonic metal and progressive rock, among other genres. They have released five albums: The Butcher's Ballroom (2006), Sing Along Songs for the Damned & Delirious (2009), Pandora's Piñata (2012), Pacifisticuffs (2017), and Swagger & Stroll Down the Rabbit Hole (2021).

Source: Wikipedia (https://en.wikipedia.org/wiki/Diablo_Swing_Orchestra)