Our IT department has a machine called jukebox hooked up to a sound system. Since it runs a music player daemon everybody in the IT department can control the jukebox from their own frontend, phone or whatever.

Technically you could achieve the same with a web frontend, but then you're limited to that UI. A music player daemon is agnostic to the UI, meaning there can be different UIs or you can add music via command line, text interfaces etc.