Since there have been so many different eras of heavy metal, we picked four groups to represent the "Big 4" of '90s metal. Metal has branched out and changed a lot since Black Sabbath introduced it in ...

The 1990s were one of the best decades for heavy music, so here's who we think make up the "Big 4" of both '90s rock and metal. The reason the '90s were so unique was because various subgenres peaked ...