What Billboard 200 distinction did Metallica's 1991 album Metallica, known as The Black Album, achieve first for the band?

Metallica's 1991 album Metallica, known as The Black Album, was the band's first album to debut at No. 1 on the Billboard 200.

It opened with about 598,000 copies sold in the United States during its first week. That immediate chart result marked a major expansion of Metallica's audience and established the band as a dominant mainstream rock act.

The album had arrived after four studio records that built a strong following but had not reached the same level of mass-market success. Its shorter songs, polished production, and prominent singles helped it connect with listeners beyond the traditional thrash-metal audience.

Metallica eventually spent four consecutive weeks at the top of the Billboard 200. The chart achievement is distinct from its international performance: the album also debuted at number one in several other countries, but the Billboard milestone specifically refers to the United States album chart.