the big four of thrash is anthrax, megadeth, metallica, and slayer, but there are plenty more good thrash bands like exodus, kreator, testament, dark angel, and overkill
[anthrax], [megadeth], [metallica], and [slayer] are the bands that make up the big four of thrash metal
"the big four of thrash is anthrax, megadeth, metallica, and slayer, but there are plenty more good thrash bands like exodus, kreator, testament, dark angel, and overkill" What is the definition of "big four of thrash"?