Shawn Carter, known professionally as rapper Jay Z, appears to have removed his entire solo album collection from Apple Music overnight. Now, when searching for "Jay Z" on Apple Music, only songs in which he collaborated on with other artists are available to stream on the service in the United States and elsewhere.
Jay Z co-owns Tidal, a rival streaming music service, so his decision to remove his discography from Apple Music could be for competitive reasons. Kanye West, another stakeholder in Tidal, also implied that there might be some animosity between Apple and Jay Z in a series of tweets last year.
Jay Z's albums appear to have been removed from Spotify recently as well, however, so his decision might be unrelated to any potential feud with Apple. Spotify on Twitter today said it can "confirm that some of Jay Z's catalogue has been removed at the request of the artist," but it did not provide a specific reason.
https://www.macrumors.com/2017/04/07/jay-z-removes-his-albums-from-apple-music/