These are the ones that immediately spring to mind.
Black Sabbath - it all started here. My mum had a best of collection kicking around and I absolutely rinsed it doing my paper round when I was 13. Then came the self titled and Paranoid. Never stopped loving these guys.
Then my brother introduced me to Metallica. First 3 albums mainly. Seriously, I used to be so into this band and yet now I just find them hilarious.
System Of A Down changed things up a bit for me. My best mate bought the self titled, I bough Toxicity and we swapped. I've still got a soft spot for them. So many drunken sing-alongs.
Nine Inch Nail's The Downward Spiral. Although I've grown out of them since, I found them at a crucial point in my life and I'm always going to be grateful for that.
And Radiohead, starting with Pablo Honey and My Iron Lung EP. The first non-heavy band I really got my claws into. While I prefer other albums and b-sides of theirs, these two always take me back to being 15 again.
How could I possibly forget! I bought James O'Barr's The Crow when I was 13 or 14 cause you know, spooky. It's inset with lyrics from The Cure and Joy Division et al. Because of that graphic novel I bought The Cure's Pornography. I remember being blown away straight off the bat...
... and it set in motion a love for the band that's still strong. I love a bit of Joy Division too but that Cure album really hit me.
Jam it back in, in the dark.