Truthfully I've wondered sometimes. What sets thrash apart from more traditional heavy metal? Is it the riffs? The tempo? Guitar and bass tones? Chords and patterns? Palm muting usage? I've heard a good degree of palm muting get used in the more traditional stuff. Sometimes I honestly don't know. I mean I've heard stuff like Iron Curtain and Dexter Ward make stuff that sounded almost thrashy, mainly the tone but they get grouped into the traditional circle. So really what sets this apart from From this?