This article is mostly about the release schedule of music (TLDR: one song at a time, once every few months), saying very little about how the actual music has changed. For more on this, music journo Liz Pelly has written a lot about what she calls "Spotify-core", a new-ish genre of music which works as both background and foreground music. https://thebaffler.com/downstream/streambait-pop-pelly