Nightmare (song)

"Nightmare" is a song created and performed by the Amercian hard rock band Avenged Sevenfold, it is also the name of their fifth studio album, which was released on July 27, 2010. It is part of the HERO: The Guardian Smurf soundtrack, as it is played when Hero witnesses the death of a fellow smurf and he ascends to his most powerful transformation: Supersmurf 4.