Why? Who put that idea into your head?
Heh! I told you I was close-minded! This is just my opinion.
Flutes- Cathedral's Reaching Happiness, Touching Pain. Off of their first album. Please listen to it and tell me what's not metal with this song and how the same effect could have been achieved without the flute.
Never heard the song, so I can't comment on it. See, though, this is my point. The only "effect" that kind of sound has is that it detracts from what I consider the "essence" of metal to be.
Clean Singing- Rob Halford, Ozzy Osbourne, Bruce Dickinson, and Ronnie James Dio... none of them have been on good metal albums?
OK, you got me there. But, that is "classic" metal. Of course I am a huge Sabbath fan (never got into priest or maiden all that much). Nowadays? I don't enjoy the sound when "modern" bands play it.
Acoustic guitars- I'll grant you that the very definition of metal requires distorted guitar but damn to ban the idea of turning off the juice once in awhile, I guess I'm just dumbfounded.
If I want the juice turned off once in a while, I break out my pink floyd cd's!!
Now, as for the Burzum comment. I certainly do believe it softened his message. There you are, grinding away through one of his songs, drowning in its harsh and nasty noise, and all of a sudden, this high pitched keyboard comes in!! It completely ruins it for me. There is an entire keyboard song on Det Som Engang Var (I think), that when it comes on, almost completely ruins the entire CD for me. It just comes on, and the CD comes to a shrieking halt. Not good.
Anyway, these are all just my opinions of course!!!