Ok let me break it down for you... Master of puppets by metallica. Pure thrash great song... Then we have lets go for a more modern song... Soulless by Death Angel. They sound quite a bit different to me and they are indeed both in the thrash genre. One sounds more general towards the genre as i would put master of puppets due to the aggressive style of vocals and guitar. And as for Soulless theres is an aggressive sound however its a bit more progressive than ordinary thrash metal. Now a days a thrash band is either very aggressive and down right heavy such as Exodus, Dublin Death Patrol, or Evile, and then you have a more lighter variety of thrash metal such as Death Angel, Metallica, and Metal Church. Yes at one point Thrash use to be down right aggressive but now its a bit more mixed up. It's alot more different now. And back then I guess there was probably a very rare variety of not so aggressive thrash bands. But then again it can be mixed up like I stated earlier wiht Living Sacrifice. I think the example bands I listed before were more of a level of aggressiveness rather than the feel of it. Sorry about that.