I've always been a "classic rock" guy, but I've started dipping into some of the older (heavy?) metal bands the last few years. I try to learn new groups by going through teir catalogs chronologically. I'm up through Powerslave with Iron Maiden, and I've been looking for an original vinyl for Dio's Holy Diver. Dokkhen is now on my radar, too, after hearing their song in Nightmare on Elm Street 4(?).
That said, I get distracted easily. Currently, I am enjoying Rush's debut album, and the Gorillaz are on deck.