if you have a decent internet connection you can download a lot of them from
interplay here in mp3 format:
http://www.interplay.com/interact/downloadlist.asp?Dltype=1

Though if you want them ALL like I did, the music is in ACM format on the
cd's and unpacked as far as I can remember... should be easy to find...
To play them you can do either of two things:
If you use winamp, and only winamp, then you can just use the
ACM-winamp-PLUGIN... That's what I do because I can't be arsed to convert
them all to mp3...
Or if you can be arsed to convert them all to mp3 you can use the acm to mp3
converter(s)... duh.
both plugin and converters should be downloadable here:
http://www.duckandcover.net/fallout2/modtools.php

have fun.