If you've installed telnet on your Corza and have a separate share (or multiple shares) for your music you can run this command:
Replacing your_music_share_name with the name of the share where your music is located.
ln -s /mnt/md1/your_music_share_name/ /mnt/md1/public/music/share1
This should create a folder in your public/music folder which references the content of your music share without needing to move or duplicate it. You can also repeat this multiple times, so if two people have shares with music on but want to be able to listen to each others music you could do:
And presto, both people can now listen to each others music over iTunes while retaining control over the content of their respective libraries.
ln -s /mnt/md1/first_persons_share/music/ /mnt/md1/public/music/first_person
ln -s /mnt/md1/second_persons_share/music/ /mnt/md1/public/music/second_person