I got into metal at a young age. My older brother gave me
a compilation tape of various metal and hard rock artists. I was instantly into Judas Priest, King Diamond and Testament. I had also heard a few Iron Maiden, Black Sabbath, Metallica and Slayer songs, but this tape is what really got me into it.
At that age I also listened heavily to Guns N Roses, but even then I was trying very hard to ignore their filler. I eventually got bored with them and now only like a handful of songs. I also enjoyed Pink Floyd, Animals is the first record I ever bought myself (and Appetite for Destruction the first CD I owned, received on my birthday).
It took some time before I delved more seriously into the genre, and the more "underground" artists I discovered after were Anacrusis, Bathory, Overkill, Amorphis in the early 90's, and in the mid-90's I got into more euro-metal: Blind Guardian, Therion, Moonspell, Emperor, Storm, Tiamat. At the same time I started to discover darkwave/ambient and neo-folk, such as Mortiis and Wongraven, but I am still today very much a n00b.
All across those years, I also listened to a lot of assorted movie scores, video game soundtracks, new age (Kitaro) and classical. And more recently (less than 5 years or so) I started to discover folk music. Stille Volk and Garmarna are two big favourites.
I still like all of the above, or at least their classic material. The only band I was heavily into at the time, and now I barely listen to at all, even their classic stuff, is GnR. Too much filler, really.
So, today... mostly metal, I'd say around 75% of what I listen to (very approximate estimation, but I reckon it's at least that much). The rest is comprised of folk, neo-folk, darkwave/gothic, ambient, movie scores, game scores, classical, classic or progressive rock, and the odd new age artist here and there. Tried as I might, there's very little music outside of those that I like.
Jam it back in, in the dark.