Here's a double dose of John Williams!
"The Imperial March" performed by the Vienna Philharmonic Orchestra and conducted by Franz Welser-Möst during the Summer Night Concert 2010. Experiencing this track during Star Wars in Concert in a Bell Centre packed to the rafters a few years ago sent shivers down my spine. But this performance set in such an incredible setting is simply awesome.
Another live performance, this time for "Duel of the Fates." These two tracks could well be John Williams' best creations ever!