Update: I figured it out. For anyone that is curious, all you have to do is mimic the folder structure in the .bsa file and place those folders in the data folder like your mods. For example, to replace the main theme, I converted my mp3 to a .wav, then my .wav to an .xwm, then I renamed that .xwm to mus_maintheme.xwm, then I place my new theme song in the follwing folder configuration in the main skyrim installation directory: data/music/special/mus_maintheme.xwm. I dont know if it matters or not, but I checked load loose files when starting the game up, and voila, my conan mountain of power theme replacement started playing
Something else of use that I just found: If your playing on a laptop, and the sound seems quiet, go to control panel/hardware and sound/sound, select your laptops speaker from the list and select it, right click and select properties, and then click on the enhancements tab, then put a checkmark by loudness equalization. This worked wonders for me, and now my conan theme music(and the whole game for that matter) sounds like it should! I imagine this tip just fixed several different games that were quiet and hard to hear without headphones for me.
Edited by hirokitanaka, 03 December 2011 - 05:06 AM.