With rdio shutting down, I'm weighing the pros and cons of the various competitors.
Obviously, Google Play All Access is available, and none of the others have official apps, but I was able to sideload rdio and it worked fine with a keyboard/mouse.
I'm wondering if anyone had any experience with Spotify, Tidal, Deezer or Apple Music, or if you have suggestions for alternatives that I may not have considered.
It should be possible to sideload Spotify and play music to it with Spotify Connect.
See: http://androidtv.news/2015/11/the-unofficial-guide-to-spotify-connect-on-your-android-tv/
However, I don't believe that there's really been a major push by anyone else to support Android TV.
Google Play Music is pretty great on Android TV, my phone, computer, tablet, etc... If you are looking for a good experience on pretty much anything, it is probably the best option. The fact that you get a membership to YouTube Red alongside it is just a bonus honestly...
Still waiting on spotify support like chromecast - AndroidTV is a second class citizen compared to chromecast it would seem.
I have the Spotify app sideloaded on my Shield AndroidTV. Works fine as a Spotify connect target.
Kodi has a Tidal plugin which I have installed on my NSTV, works great as long as you select anything but lossless as the streaming quality; this leads to failed playback.
Emma for Spotify is a really good app. There is a free version but you need to buy the pro version to access your playlists etc. You also need a premium Spotify account.