Definition of Speed metal

Speed metal is a subgenre of heavy metal that spawned in the early 1980s and was the direct musical progenitor of thrash metal . When speed metal first emerged as a genre, it innovatively increased the tempo of the music template set forth by Judas Priest, Black Sabbath, Led Zeppelin, and Deep Purple while keeping their melodic ideas. Speed metal can find its significant beginnings within NWOBHM bands.