CD reissue. Double X is the tenth album by the German hard rock band Bonfire. It was released in 2006 by BMG International. It celebrates 20 years of Bonfire music. Bonfire (originally known Cacumen) is a German heavy metal band, founded in Ingolstadt, Germany in 1972 by Hans Ziller. In 1986, based on the advice of the record company and the management, the band changed it's name to Bonfire. Hans Ziller is still in the band.