Streaming playlists are the new mood rings. They aren't just for background...

https://wiki-tonic.win/index.php/The_Science_of_the_2_A.M._Burnout:_Music_for_Late-Night_Studying_and_Sleep_Prep

Streaming playlists are the new mood rings. They aren't just for background noise anymore—they’re tools for managing your mental state. Algorithms on Apple Music now learn your rhythms, curating tracks for focus, deep sleep, or managing city stress