I was thinking it would be nice to annotate individual songs. Comment on them, like a social feed. And if you don’t want the social aspect, have the annotation be available/visible in Private playlists only. You can also limit the character length to make the comments more succinct.
From the Deezer perspective I can see the value, as it would be a source of metadata to describe the content. That’s feeding the AI machine our preferences, but I don’t know about y’all, I don’t mind having Deezer give me the songs that most accurately fit my mood or my state of mind.