THRASH METAL is a subgenre of heavy metal that is characterized most typically by its fast tempo and aggression. Thrash metal songs typically use fast percussive beats and fast, low-register guitar riffs, overlaid with shredding-style lead work. Lyrically, thrash metal songs often deal with social issues and reproach for The Establishment, often using direct and denunciatory language, an approach which partially overlaps with the hardcore genre.

The term “Thrash Metal” was first referred to by the music press was UK’s Kerrang Magazine journalist Malcolm Dome while making a reference to the Anthrax song “Metal Thrashing Mad” in Kerrang issue number 62, page 8 published on February 23, 1984. Prior to this Metallica’s James Hetfield referred to their sound as power metal. Here is a list of 10 best thrash metal bands from Canada.
(SOURCE: WIKI – http://en.wikipedia.org/wiki/Thrash_metal)