What is Metallica's self-titled 1991 album, commonly known by its cover-inspired nickname?

Metallica's self-titled 1991 album is commonly known as The Black Album.

The official title is Metallica, matching the name of the band. Fans and music publications adopted The Black Album because the cover is almost entirely black, with a subtle gray outline of a coiled snake and the band's logo.

The nickname also helps distinguish the record from other albums called Metallica and from the band's earlier releases. It became one of the best-known informal album titles in popular music, even though “The Black Album” does not appear as the official title on the record.

The album was Metallica's fifth studio album and followed ...And Justice for All. Its accessible production and songs such as “Enter Sandman,” “The Unforgiven,” and “Nothing Else Matters” brought the band a much wider international audience.