I am absolutely LOVING Volumio. It's running in a VM in my garage computer that does various other things. At the time, Volumio didn't have a clean way to do this so I just hacked away until it booted and played music.

A little USB sound card is passed through to the VM and it's been rock solid for about 2 years now. I use it exclusively as a Spotify chromecast type thing that cost me about $3.50 in parts.