Enter Sandman is one of Metallica's best-known songs, released in 1991 as the opening track of their self-titled album, and its riff has become shorthand for heavy, confident entrances. Audition versions circulate online because the song is a popular, demanding choice for singers and bands trying to prove themselves. This short clip fits that tradition, and creators keep reusing it because the instantly familiar riff does most of the storytelling before a single joke or reveal lands.