> I believe Music Key at this point is dead (Youtube Red replaces it). Music Key was only ever in beta and not ever fully launched (as it was invite only). So as far as I'm aware there are only 2 music/video subscriptions now: Youtube Red and Google Play Music.
Substantively, it seems that their is just one, with two different names: the announcement indicates that YouTube Red will include Google Play Music subscription, and vice versa, and the pricing is the same, so essentially there is one audio/video subscription service.
Different websites on different urls with different giant Javascript application, also different mobile apps, and built by different Google business units. So two services.
Substantively, it seems that their is just one, with two different names: the announcement indicates that YouTube Red will include Google Play Music subscription, and vice versa, and the pricing is the same, so essentially there is one audio/video subscription service.