I've made a custom music pack for EfU purposes.
It changes the Underdark, Sanctuary, Battle and Tavern themes to much more EfU-appropriate things, and is probably a breath of fresh air for anyone who is still using the standard NwN music, or even no music at all these days.
The file is ~350meg and is very simple to install, though of course I'd still recommend you backup your old files in case something goes wrong, you don't like the new tunes, or you ever want to go back!
OK since I've not had any complaints about corrupted tracks and generally everything ingame seems to tally... if you want this override grab it from the following links :
http://www.efupw.com/downloads/EfUMusic.7z
Goes in music folder
http://www.efupw.com/downloads/WAV%20OVERRIDES.7z
Goes in override folder
hope you enjoy it!