That is exactly what I was wondering about, but never tried.
One thing that I did try was "su"ing into one of the users that I had just created and tried accessing from there. I still wasn't able to access the folders. I'll play around with it more when I get home this evening.
One other question that I have is how do I ensure that anything that I drop within that folder will be accessable by anybody in the MP3 group? When copying in quite a few folders I've noticed that the owner is me (user account "ryan") and the group was also set to my own individual group (ryan).
I know I can do it manualy using chgrp but I would hate to have to do that every time I add a new CD to my collection. (yes... this is a completely legit collection