The most low key "Satanic" music genre is unironically Ambient music and EDM/IDM in general.

Guarantee some of those classical composers you think are "wholesome and trad" were channelling some dark shit as well which is why all the pearl clutching over aesthetics and degeneracy by christfags is so funny to me

As a Luciferian I love EDM, the message of light and love with psytrance festivals being the closest thing to the old ways we have these days open to the public is sublime.