I've seen Whitesnake two years ago and I can tell you that they're not that exciting TBH. I don't know aboud David voice right now, but it wasn't too great in 2009. Scorpions, on the other hand, are amazing, I'm unpleasantly surprised that they're not coming to my country as a part of the farewell tour, because they've been in my country like 3 or 4 times already and they have a huge fanbase. You russians have been lucky lately as far as rock concerts go. GN'R, U2 and now Scorpions.