As time marches on you can always count on the power of primeval riffs to ground you in the '70s. So turn back the clock to these metal and proto-metal classics—the guitar-and-organ grinders by Uriah Heep and Deep Purple, the four-on-the-floor blowouts by Montrose and Judas Priest, and the punkish slams by Motörhead and Iron Maiden. Then go completely timeless with Kiss, Queen and Alice Cooper.