"The companies will begin rolling out the experience through an invite-only beta test later this year, with general availability in 2017."Can you connect it to a sonos speaker?
I don't think it's ready yet, but when it is, you should be able to use Alexa to tell Sonos what to play.
If you want high quality music, you can use a Sonos Connect with a decent stereo. If you want just a generally fine sounding system, Sonos speakers will do, but then you could just use a cheap Echo Dot with a cheap (or old) stereo and you have it all.