Wolfgang Gartner offers up ‘Speed of Sound’ for free Wolfgang thanks fans with a new free download following the release of his comeback album. Related Posts: Good Morning Mix: Relive ZHU and NGHTMRE’s global back-to-back debut at Digital Mirage Friendsgiving KSHMR drops new single ‘The World We Left Behind’ featuring KARRA, announces debut LP ‘Harmonica Andromeda’