I find it strange that Spotify is able to list almost any band and music out there, and streaming video providers not. They are even forced to create their own content. Seems that the music industry has a better separation between content creators and providers than the movie and series industry.
Music is subject to compulsory licensing. Something that made sense when only big companies could record and distribute music (making cartel behavior easy), not so much now that anyone with an iPad and an internet connection can do so.
-There is a compulsory performance license that allows radio stations to play any music. They have to pay the song writers and the music writers (?) a fee based on a mandated structure but not the actual singers.
-There is a separate compulsory licence for Pandora like services where you can't choose your music and there are guidelines that Pandora has to abide by.
-There is no compulsory license for on-demand subscription services like Spotify where you can choose the music you want to listen to.