One of the main complaints w/ Spotify is its lack of a "Pandora-Like" Radio option. However, if you seed a playlist with specific songs and then start the Playlist, a "Start Radio" button appears- VIOLA, problem solved.
However, there isn't a "Start Radio" option linked to the Playlists in Sonos!!! Please fix this...and yes, I'll post this suggestion on the Sonos site as well!
Other Sonos users, please do the same!