Metallica released five commercial singles to promote its 1991 album, commonly called The Black Album.
The singles were “Enter Sandman,” “The Unforgiven,” “Nothing Else Matters,” “Wherever I May Roam,” and “Sad but True.” Together, they gave the album an unusually broad promotional campaign and showcased several different sides of the record.
“Enter Sandman” served as the lead single and introduced the album's central sound to a wide audience. “Nothing Else Matters” demonstrated the band's ability to succeed with a more melodic composition, while “Sad but True” emphasized the record's slower, heavier groove.
“Don’t Tread on Me” is a frequent source of confusion. It was sent to rock radio after the album's release, but it did not receive a commercial single release. That distinction is why the accepted total is five rather than six.