Yes it is, what I have said all along is an opinion, however I can explain why I think that. In my opinion `heavy metal` is sort of where the band wears studs and such imagery as Judas Priests Rob Halford wears on stage, where they sort of act hard and hold their fist. clenched and such stereotypical poses. Also the music with heavy metal was a step onwards and away from using blues scales and bluesy type riffs ( though they do of course use blues scales at times ) and were more towards sort of `non feeling` riffs of power chords and speed of songs. The tempo was faster and the vocalists scream like they are angry at the world and they use persistant `fantastic imagery` on their album covers etc. All these things they picked out from bands such as Sabbath, but they exagerrated it to a great extent. That is sort of the genre that is heavy metal, in my opinion.