Holy Cow, Burzum sounds extremely outrageous Eldorion. I gotta love the Tolkien quote the critic of Burzum finished up with

. I vaguely remember hearing some Cirith Ungol.
I'm not certain about the Sabbath Song, The Wizard. It could be Gandalf, but without reading the lyrics I can't be sure. It could be about Aleister Crowley, a favoured topic of Ozzy and Sabbath.
And sorry B'arelyn, I haven't heard of that last artist you mentioned either

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GB