Now, my dad is a metalhead, with some interest in 60's garage punk, and with his combined CD and vinyl collections would easily have over 1000 albums, so I can't say I'm surprised that judging from the covers I picked three metals albums, two from the 80's, and one more recent.
Metal as a whole is one genre I've only really scratched the surface of, so this should be interesting...
Dream Evil - The Book of Heavy Metal
Crap, it's power metal! And has possibly the most obnoxious and egotistical album title ever. And is filled with wanking guitars. In spite of this, I enjoyed it. It was heavy enough without going overboard, the singer's high voice surprisingly didn't annoy me, and it flittered around with a few different metal styles and instruments. In the end, it is still power metal.
Judas Priest - Point of Entry
Good, a band I've heard of. This is how you do power metal, and this is a nice slice of early 80's metal, before it had fully earnt it's 'heavy' moniker. Everyone knows how awesome Robert Halford is, and the rest of the band are just as good. I really need to get into Judas Priest.