Something that just popped into my head- I can remember a couple of years back that there were these kids who were playing some game on a PSP. What's odd is that I heard music from Oblivion coming from it.
At the time I thought they were playing the PSP version of Oblivion (The Elder Scrolls Travels), but that was never released. I doubt that they were all crowding around the screen to listen to the soundtrack on it's own though.
What the heck were they playing?

you memory's betray you friend.

unless it was an ES:T demo then it was likely other dramatic style orchestral music you were hearing.

The oblivon theme sounds a lot like the Pirates of the Carribean theme. Maybe they released a PSP game?

The music was one of the explore tracks, so that rules out a POTC game.

Perhaps they were able to put the mp3's on to their PSP? Otherwise you must have been mistaken because there haven't been any Elder Scrolls games releases on the PSP.