I can only remember The Headbangers Ball playing videos after midnight.And then theyvstarted getting some rotation on the regular MTV hours but then so did bands like Megadeth, Danzig, Ministry etc. ....I don't consider Pantera mainstream no matter how much they sold....theres a lot of metalheads around. When they all or the majority dig something it could move some units. Black Sabbath had platinum albums but were never what I consider mainstream. When ever someone gets popular there are followers who jump on the band wagon though. I get that..No radio station played Pantera were I live, though.