In game music, I did that for TESIV:Oblivion all the time until the quality and quality of mods I was installing in my game forced me to disable that to increase performance, and I had continued that process for Fallout 3 and Fallout New Vegas.
But I am building a brand new computer now, so I will once again be able to play the sound track created for the game, to this day I have never heard the ones for Fallout 3 and Fallout New Vegas.
And with the http://elderscrolls.com/skyrim/media/videos/official-trailer-4/, that has been out for TESV:Skyrim, I Think It Is A Must to be able to listen to it and play.