GarageTunes is a lightweight and fast music player for single users and groups.
It finds all music files (.mp3 and .m4a/AAC) currently on your hard disks (internal and external).
GarageTunes is ideal for listening to music at work or at home with your friends: It lets you listen to music files on any Mac running GarageTunes in your local network.
Streaming built-in:
You can output your music files on any Mac on your network running GarageTunes, or on any second generation AppleTV.