Welcome back to our Taxonomy series, where we break down umbrella genres like progressive metal, post rock and doom metal and outline all of the progressions and subgenres that have matriculated over the past few decades. The dissection of thrash metal you'll find below contains a detailed dissection of the most crucial genre in extreme metal style. Thrash led to incredible innovations over the years, and in turn, a multiplicity of styles has made its way back into the genre's core traits to form some of the most forward thinking metal coming out today. Seriously, many of the bands mentioned below have released records less than a year ago, and in some cases, less than a month. There's a ton of ground to cover here, so without further ado, let's riff on some of the best thrash you can use to mosh in your bedroom.