SensMe in Sony and Sony-Ericsson phones and players. It was the tool that analyzed your music collection and sorted it according to energy, mood and tempo.
The best variant was on the later products whey you had a list of channels representing either moods/styles (Energetic, Emotional, Lounge, Dance etc.) or time of the day (from 'Morning' to 'Midnight'). The results were very good, especially for the time channels (except the morning) which were perfectly fitting the mood and pace of times of the day, much like Indian ragas. It really felt like your personal radio stations, freeing you from having to make playlists by yourself ever again...
It was discontinued in 2010s because of declared low adoption by users according to some obscure internal studies :( I've been dreaming of replicating it using Python ever since, but never had time to do a proper research.
This + package to enable VSCode marketplace. The only VSCode features it lacks afaik are out of the box settings sync and remote container development, which colud be substituted with plugins.
EDIT: also be sure to check out Lapce suggested by Yote.zip - it's a banger.