Nightmare is the title track from Avenged Sevenfold's 2010 album of the same name, a heavy metal anthem built around dark imagery and an aggressive, theatrical sound. The song became one of the band's signature tracks and has stayed popular with rock and metal fans long after its release. Short excerpts like this one circulate widely on soundboards and in short-form videos, where the opening intensity works as instant shorthand for danger, drama or a looming showdown. Its recognizable riff keeps it useful for creators who want a serious, high-energy cue without a long build-up.