Hi and thanks for your feedback. I've moved your post to the Content Questions board, where we can discuss the available Spotify library as well as the Spotify-curated playlists. In reference to your comment, missing or unavailable music is almost always a decision by the artistto withhold the content from Spotify. In the case of Prince, you can read more about his decision here. While it might be a good idea to contact the label directly and ask why the music isn't on Spotify, you can also fill out this form to let Spotify staff know of your interest. You might also be interested in supporting this idea, which suggests a simpler method for requesting albums missing from Spotify.