I don't know if I'm aloud to post youtube links?
http://www.youtube.com/watch?v=EynZ65x6Tmo&feature=related
http://www.youtube.com/watch?v=xBSiIeu1Yg8&feature=player_detailpage#t=49s
http://www.youtube.com/watch?v=0J5gN1DwNDE&feature=player_detailpage#t=14s
Skyrim is easily the most epic composition out of the three, but Oblivion to me sounds closest to Pirates of the Caribbean. It's not exactly the same, but the general feel of theme music just go together IMO.