When Spotify deprecated audio_features and audio_analysis , the obvious loss was the per-track numbers — tempo, key, energy. The quieter loss was everything you used to build on top of them: the "what should I play next" logic, the harmonic-compatibility checks, the auto-ordered playlist. Plent...
Source: [Dev.to](https://dev.to/birrings/build-a-harmonic-dj-set-planner-in-50-lines-4oj5)