I haven't seen this but...

Just curious, is this about thrash (stuff like Slayer, Sodom, Kreator, Dark Angel, ect) and how it would die out for the newer wave of death/black metal? Or does it focus more on the more commercial friendly bands like Anthrax/Megadeath/Slayer(Sacred Reich?!?), ect? I'd like to see the older thrash band's views on how thrash died out and how death metal came to be.