How do I share and play music in my office? I would like to use my old Macbook that is hooked up to stereo equipment, as a media server to allow everybody in my office to play or upload music, jukebox style.

The best case would be a web interface where I can change the music, an upload feature is not mandatory.

A solution using Ubuntu would be fine too. :)
Check out 'play' from one of the guys at GitHub. Ive had an interest in it, but never had a chance to use it yet.