I can't believe I haven't seen this thread before! Way to go OP!
As a formally trained musician, I love, listen to, and appreciate all kinds of music (jazz included), but metal is among the more fun ones to listen to for me. I thought I listened to some pretty heavy stuff, like Pantera, Slayer, Killswitch Engage, Meshuggah, Tool, Metallica, etc. until I met my SWMBO. :-D
First time I met her, we were talking about music we were into, and she said, "Oh, Slayer? Yeah, they're pretty good- kinda soft though." That's when I knew I had someone special on my hands.
She's from a Norwegian background, and has subsequently schooled me on the likes of:
Dimmu Borgir (far and away her favorite)
Dawn of Ashes
And I thank her kindly for it!