Multiple Room Music Solutions
Sonos launched their revolutionary product in 2004. Using a protected WIFI/mesh network, they have 2 basic products, controller and base station, that can be mixed and matched throughout your home. There is a very high threshold of support for 32 zones. I can't imagine how usable such a system would be as anything more than 8 gets to be a bit unwieldy with their screen-challenged, wireless controller. However, the Sonos product fully supports UPNP so other control devices and options are possible if not encouraged by the manufacturer. The other huge problem with any hierarchical music system is navigation. Its no fun scrolling through thousands of entries before getting to what you wanted. Vox UI has a customized solution for this.
