What Billboard 200 milestone did Metallica's The Black Album reach in December 2019?

Metallica's The Black Album reached the 550-week milestone on the Billboard 200 in December 2019.

That achievement demonstrated the album's exceptional longevity. Released in 1991, it continued appearing on the US albums chart for decades after its initial four-week run at number one. Its staying power came from a combination of enduring physical sales, continued listener interest, and the permanent popularity of songs such as “Enter Sandman” and “Nothing Else Matters.”

The milestone is often confused with the album's earlier chart records. The Black Album was already notable for becoming Metallica's first Billboard 200 number-one release and for spending four consecutive weeks at the summit. The 550-week figure refers to cumulative chart presence, not weeks spent at number one.

In the broader history of traditional albums, the record ranked behind Pink Floyd's The Dark Side of the Moon at that point. It was also later described as one of the longest-charting albums of the Nielsen SoundScan era, underscoring its unusual commercial endurance.