Who doesn't love some thrash? When you need to let out some aggression and the traditional stuff just isn't enough, you need something a little more powerful, a little more energetic and little bit faster, right? Well, that's how it started at least, borrowing the gallop from the NWOBHM, stripping away some of the melody and tossing in some punk attitude and rhythm work.
There were primitive rumblings of this new style's formation around the world with radically different styles between the Bay Area, the East Coast of the U.S., Brazil and Germany primarily. The Bay Area was undeniably the most potent as Metallica, Exodus, Testament dominated the circuit with this ferocious new brand of metal with Slayer and Megadeth not far from reach elsewhere in California.