Metallica's 1991 album Metallica led the Billboard 200 for four consecutive weeks.
The album debuted at number one in the United States, marking the first time Metallica had reached the top position on that chart. It entered after a first-week U.S. sale of roughly 598,000 copies.
A consecutive-week run means the album held the top position in successive chart issues without another album interrupting it. Metallica's four-week run helped establish the record as more than a successful heavy-metal release; it became a sustained mainstream event.
The album's chart performance continued long after its initial peak. Strong catalog sales, repeated reissues, and continuing interest in songs such as “Enter Sandman” and “Nothing Else Matters” allowed it to remain one of the longest-charting albums of the SoundScan era. Its later sales milestones further reinforced the importance of that 1991 breakthrough.