Go2Linux posted a tutorial about streaming music with gnump3p and Linux
If you have a big collection of music, you can’t have in all your computers, so you'd better have it only in one of them and share it with the others.Streaming music with gnump3p and Linux - mp3, ogg, movies | How to
There are a lot of ways to do that, you can use Samba, NFS, or other means to share you drive with others, and thus your music collection, but a better way IMHO, is to share it using a streaming server.
