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Here's an interesting fact about Metallica:

Metallica's 1991 self-titled album, often referred to as "The Black Album," is one of the best-selling albums of all time. It has sold over 31 million copies in the United States alone and over 30 million copies worldwide. This album includes some of their most iconic songs, such as "Enter Sandman" and "The Unforgiven," and it marked a significant shift in their musical style towards a more mainstream sound while still retaining their signature heavy metal roots.