I really really dig this mashup/remix of Save the World by Swedish House Mafia. Probbaly 99% of the mixing was done beforehand but I don't care because it was that good and gave me goosebumps. Well done.
And here's their full set taken by one of the many fans dedicated enough to record the entire thing using their cellphone:
As you can see their production value is through the roof which should put many of these top DJ acts asking for $100-200k a night on notice that this is the new standard that us EDM fans expect if we're going to shell out big money to see you live. One can hope right?