Sonos UI on RPi

I have a sonos connect that is not currently being used and want to hook it to the analog in on my tv. I thought that it would be simple enough to plug the audio and but the TV wont tune the input without a video signal. Is there a 3rd party UI that I could run on an RPI? I did some googling but most the top hits didn't seem relevant. 

A number of people have created third-party web interfaces (for example, http://www.purple.org/sonos/), but the Sonos is going to sound terrible through your crappy TV speakers.  Even a cheap set of computer speakers would be far better.