6. Metallica – Metallica
Thrash metal wasn’t always part of the mainstream music. Before the ’90s, thrash metal had a smaller audience and wasn’t commercially successful as you may have thought. Metallica’s self-titled album is credited for bringing thrash metal to the wider audience and establishing it as commercially successful. It remains Metallica’s most successful album to date at least when we are talking in terms of sale. It also helped to bring other thrash metal acts to attention like Anthrax, Megadeth, and Slayer.
