"Holy Diver" and "The Last in Line", are two best Dio albums out there. Can't be missing from my collection. Along with a few songs from the other albums (and many songs from other similar artist I listen too a lot), I have them on my cell phone, so when I'm not home I can listen to metal on the road (that is if I'm not on my car, say more like Public Transport - bus, light rail. Or when my grandma has doctor appointments. I could be up to an hour in the waiting room)