When I ask "Alexa, Play some music for me." I get response that music and playback are not supported on this device.
Thanks for your interest in AVS! Some music playback service require certification with Amazon. Please see this related forum post for information about how to get your device tested and approved for music: https://forums.developer.amazon.com/articles/59778/launch-with-avs.html
Let us know if you have any other questions!