Spotify is definitely no stranger to statistical analysis, pattern recognition and meaningful recommendations. In fact, the "Discover" algorithms are what most really value in the vast platform that does a surprisingly good job of introducing users to potentially interesting artist. Leveraging that, Spotify is apparently experimenting with inserting personalized songs into its official playlists. A company spokesperson has confirmed that a test is being carried out on a limited number of users and on "mid-tier" playlists. Typically, these curated playlists tend to get updated by...
Source: https://www.gsmarena.com/spotify_is_testing_personalized_entries_in_its_curated_playlists-news-33410.php