Slayer 's roots can be traced back to the 1980s , if not further . ` ` ' Six '' is cited as the first record to represent this burgeoning regional movement . Green River is often cited as the first Slayer band .
Grunge 's roots can be traced back to the 1980s , if not further . `` Deep Six '' is recognized as the first record to document this burgeoning regional sound . Green River is often cited as the first grunge band .