Nightmarer, the band featuring ex-Gigan vocalist John Collett, ex-War From A Harlots Mouth guitarist Simon Hawemann and drummer Paul Seidel (The Ocean), are streaming “Death/Swansong,” via Decibel. You can check that out below and pick up the band’s new album “Cacophony Of Terror” on March 23. Hawemann commented: “Our track ‘Death‘ marks the inevitable end…