Similarly interesting is a fairly recent Polish black metal band that incorporates Catholic hymns/chants in their music. Although in this case I think it's likely done in irony, or with sacriligeous intent.
Then there’s Reverorum ib Malacht, the Black metal band who studied Catholicism so intently in order to make even more evil, sacreligious music, that they actually ended up converting.
http://www.invisibleoranges.com/reverorum-ib-malacht-intervi...
Of course, the best black metal is heathen, but when 99.9% of it is, that's to be expected.
https://www.youtube.com/watch?v=t106yVE6dYg
Not sacrilegious, quite the opposite.