Google Play's radio feature has been amazing in my experience, and way better than Spotify's. Especially for stuff which is a little bit out of the mainstream,

Google Play's radio feature has been amazing in my experience, and way better than Spotify's. Especially for stuff which is a little bit out of the mainstream, the selection-quality is so high that I wouldn't be surprised if they were using some of their Google suggestion-fu to generate it from what tracks users have played together in the past.