Well, a German friend of mine said:
"Ach, I don't think that you'll gonna find any significant difference when it comes to rock and metal classics, since especially the classic songs are quite universal.
Slayer, Metallica, Maiden, Slayer, Megadeth, Motörhead, Slayer or Slayer will always work, I think. Smile
If you can assume a more metal oriented audience, you could do some classics of Kreator or Sodom for instance.
Maybe it would be fun if you try a cover of something of the Toten Hosen or Die Ärzte. Assuming that your singer's German is maybe a bit rusty that would be either quite entertaining - or ridiculuos. A bit risky maybe."
But when I suggested some Scorpions he said:
"Uhm, I would think that over again, really.
Unless you're playing in front of a bunch of 40+ old, you know, Volvo driving teachers who think that Genesis really do rock, that is.
The reception of the Scorpions differs a bit in Germany and the rest of the world... "