Perhaps someone can explain this odd behavior from the Apple Music app. On occasion, both my wife and I have seen seemingly random (though actually related) songs added to our libraries automatically. At first I thought it was using the 'Add Playlist Songs' setting in the Music configuration page but she has only been playing specifically chosen albums. This has been asked on the official Apple help forums with few answers getting to the bottom of the issue - only suggestions. I have to say that this has not happened to me in months, however. Could it be related to our family subscription?