The Finns might be aware of both of these, but Hexvessel are a great retro-folk band. Their cover of Diamonds by Paul Simon adds another dimension to an already great song.
And finally as this is the English forum

One of my all time favourites!Jiva wrote: Mana Mana.
Insanus wrote:Sopor Aeternus is a classic.
Sopor Aeternus - Backbone Practise
https://www.youtube.com/watch?v=SyJM_4Qjrb8
Marilyn Manson, anyone? (Who by the way seems to enjoy the movie Holy Mountain -which was mentioned here some time ago- quite a bit. Maybe it's just me but something in this video reminds me of the beginning of that moviehttps://www.youtube.com/watch?v=hbHfhDm-H1U)
Perhaps even...Lady Gaga?Actually mainstream pop in general stresses the death of ego & strong sense of self & mission so much in all it's superficial imagery that the whole genre is occult to me. Gaga just mixes a couple of symbols in. (though pentagrams are not so rare on late night MTV anyway)
Funeral Mist's album Maranatha & Enochian Crescent's album Black Church are complete perfection at least what comes to lyrics. Best black metal out there in my humble opinion.
Funeral Mist - Anti-Flesh Nimbus
https://www.youtube.com/watch?v=kYAsaCXAJeM
Enochian Crescent - Chalk Face
https://www.youtube.com/watch?v=__ZmeEorgsk
Death SS is horror rock with lots of Crowley-inspiration.
Death SS - Lady of Babylon
https://www.youtube.com/watch?v=pbbTLBYoSxA
Malice Mizer - Bara no Seidou has to be mentioned just for the atmosphere & maybe
Moi dix Mois album dix Infernal might be of interest to someone whose taste in music is as teenage-goth-princess-like as mine. Of course there's ten billion other bands & artists to mention, but for starters.