Indeed. This is how I describe Subsonic to people as well. In fact there's quite a few of these solutions out there: Subsonic (and clones, eg Madsonic), Plex, Ampache, PlayOn, mpd (which has a plethora of supported web frontends). A lot of standalone players also support web frontends too, eg VLC. So it's quite an established market this is joining - which is great for us given the variety of choices we have available to us.