The Verge:

Adele’s 25 is the biggest album in the world right now, and it’s made it there all without a single stream on Spotify. In fact, it might have made it there because there hasn’t been a single stream on Spotify: Adele and her label made the decision not to stream 25 anywhere online, encouraging people to actually buy the album or its songs outright. But despite the ban, some services have songs from 25 up streaming.

25 isn’t on Pandora because Adele specifically wanted it there. It’s on Pandora because Adele and her label don’t have a say.

This is a great example of the giant hairball that is streaming services and the confusion that consumers have with regards to which service does what and how they play you music.