Avenged Sevenfold (Nightmare) Pages Home Single Album Variety Shows TV Series Drama Music Video Chords FAQ Donation Wednesday, July 18, 2012 [Album] Avenged Sevenfold (Nightmare) Avenged Sevenfold  (often abbreviated  A7X ) is an American  heavy metal  band from  Huntington Beach , California. Formed in 1999, the group consists of  M. Shadows  (vocalist),