Metallica’s 1991 self-titled album, which is also known as The Black album, is arguably their most popular record. At least, in terms of sales. To date, the LP has sold over 16.8 million units in the U.S alone and it doesn’t look like anyone is going to stop buying it.

According to Billboard, the Black album has reached its 500th week on Billboard’s Top 200 chart. It is officially one of four albums that has spent this much time or more since it began publishing on a weekly basis back in 1956. The other three albums include Pink Floyd’s The Dark Side of the Moon (937 weeks), Bob Marley and the Wailers’ Legend: The Best of Bob Marley and the Wailers (539 weeks) and Journey’s Greatest Hits (539 weeks).

For those who’ve been following both legs of Metallica’s North American touring cycles, you would notice for the most part, they’ve been closing each night with “Nothing Else Matters,” and “Enter Sandman.” Both of these songs are from this historic-500th week Billboard 200 chart record, which gives an appreciation on knowing that these tunes will most-likely never leave their setlist.