Custom Music

Hello. Say, is there a way to change the music of the OC?
I can't seem to find where are the songs stored.
I know DA:O has beautiful scores (lake calenhad is my favourite), but after my 5th playthrough i'm wanting to try a little more variety

I remember that i used custom tracks in NWN / NWN2 (.bmu files)

I don't even know if this is possible in DA:O , don't know the file formats, also don't know if there is a
mp3=> (something) conversor.  I also searched the foruns and found nothing. Sooo  any help is appreciated

Thanks in advance!