[Nightwish]

Originally Posted by 88-31-10

Heavy metal (often referred to simply as metal) is a genre of rock music[1] that developed in the late 1960s and early 1970s, largely in the United Kingdom and the United States.[2] With roots in blues-rock and psychedelic rock, the bands that created heavy metal developed a thick, massive sound, characterized by highly amplified distortion, extended guitar solos, and emphatic beats.



The rest is here.................................> http://en.wikipedia.org/wiki/Heavy_metal_music

There's a difference between being blues-based, and being bluesy. Most metal incorporates blues only in the most rudimentary manner, so that it doesn't really stand out in such a way that the average listener is going to say, "Hey, that sounds like blues!" The adjective "bluesy," however, generally indicates music that overly emphasizes the blues component. Whole both Testament and Great White play heavy metal that has a blues-based component, nobody is going to describe Testament as "bluesy," while that adjective is commonly used to describe the music of Great White.