The DJ on stage in Armin van Buuren, a Dutch, who is arguably one of the best (and as far as I am concerned the best) Trance DJ ever. He was playing the Alex M.O.R.P.H remix of Walk The Edge, one of the most beautiful (uplifting) Trance song ever. In other words, pure awesomeness.
My way of listening to that is to shut down all the light in the bathroom and have a shower in the complete dark with that music loud in the speakers... (the result is better than sex...)
Second video is a slight slightly different version with vocals, for ultra awesomeness.
... and last but not least, a third, equally beautiful version, more often played o radio: listen [youtube.com].