Spotify, please provide SONOS with the ability to support Spotify Radio. 

From the SONOS community:

John M, an employee of Sonos, replied to Add Spotify radios to Sonos !!!, an idea about Sonos.

Thank you everyone for the responses and feedback. Please let me assure you that this item is still under consideration by Sonos and that we are committed to providing a world-class Spotify experience on Sonos.

Spotify Radio was originally introduced as a Spotify App on the desktop Spotify client before being made available to the mobile app versions. Spotify Apps are small applications written within the Spotify platform and are not made available to third-party platforms like Sonos at this time. Spotify does not yet provide us with the ability to support Spotify Radio. We understand that this is a top feature request from the Sonos-Spotify community and are in discussions with Spotify on possible future implementation.

If you feel strongly about the Spotify Radio feature on Sonos, be sure to add your comments to the Spotify community, in addition to this topic here. Like Sonos, Spotify is a company that greatly values the opinions and feedback of their user community.