Oblivion had the best soundtrack out of all of the ES games IMO. Watchman's Ease, Dusk at the Market, King and Country, Wings of Kynareth, or Harvest Dawn while in the Mages Hall. Yes, best soundtrack.
It didn't in my opinion.
Reason being?
I still hum Morrowind's theme from time to time. I can't even remember Oblivion's main theme, and I played it an HOUR ago.
SO FAR however, the Skyrim soundtrack is giving me CHILLS.