I don't think I need to introduce The Scorpions, one of the most famous hard-rock band ever. Nuclear Blast is now releasing a tribute album for them. The list of the bands on that one should be enough to get you to drool all over the place:

Helloween, Sonata Arctica, Stratovarius, Children of Bodom, To/Die/For, Therion, Metalium, Steel Prophet and many others.

And most of them are real good. Which one you're going to like the most probably depends on which bands you're worshiping and which classic Scorpions songs you like. My favorites are: Sonata Arctica's "Still Loving You" (which is also available on their Successor EP) and To/Die/For's "Passion Rules The Game" (one of my favorite Scorps song).

So if you like the Scorpions or even if you live in a cave on Mars and have never heard of them, you should definetly check this tribute.