Just had this message from Napster although I am in the UK so not really useful to me.
We are excited to announce the Napster support Amazon Alexa device in the US.
In the last few months, we have been tirelessly working to improve our product to support Alexa and we believe that Napster app will help you enjoy your music experience..
You can now use Alexa voice commands to access your Napster service to play artists, songs, albums, stations, or playlists.
You can link Amazon Alexa application on your Smartphone and select Napster as the default or preferred music service.
You can download our app directly from the App Store and Google play.
To set up Napster for Alexa, please visit the below web site and follow the instructions.
Please contact our Customer Support team at email@example.com and we will be happy to answer any questions you may have on using Napster on Alexa Devices.
So, will napster now be able to be controlled through voice on Sonos or not? If not, will it now be added?