And replacing is better than replacing because it keeps things as ambiance (as long as you replace music files by something quite similar). Example? Look at the
music_br_space.wav
music_br_danger.wav
music_br_battle.wav

Listen to them too. You'll notice that "space" is what you hear whenever you're in Bretonia (because it's "br_" when nothing's going on. "danger" is what you hear when enemies are spotted. It's faster already. And finally "battle" is what you will *maybe* hear during fights (could be covered by shoot sounds ). This one is the fastest.
Well you'll notice that they all sound alike (same instruments and style) but they get faster and faster and, in-game, are mixed together to go from one state to another smoothly.
In this particular case, replacing the files will keep the "mood" change. Something you don't have with just Winamp playing random tunes.

beltic : either you replace an existing file (rename the old one to keep it) or you have to give it a unique filename, then edit Data/Audio/Music.ini and add your new file :

[Sound
nickname = music_something
type = music
file = audio\music\nameofthefile.wav
attenuation = -15 ; lowers the volume (positive value might make it louder)
streamer = true

And then only you can change it in the Room files and use music_something

Thank to Threshold btw for spotting the music.ini file. I should open my eyes

Doh! hehe.. my bad..

> hank to Threshold btw for spotting the music.ini file. I should open my eyes

Lol. You're welcome.

I am always keeping my eye out for ways to redirect the game to my "new stuff" rather than directly replacing or copying over on top of the existing stuff. This feels "safer" to me since then I am not changing the original files.