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Dev.to
7/14/2026
Build a Harmonic DJ Set Planner in 50 Lines

Build a Harmonic DJ Set Planner in 50 Lines

Short summary

A tutorial on building a harmonic DJ set planner in ~50 lines of Python using the FreqBlog Music API after Spotify deprecated its audio_features and audio_analysis endpoints. Covers track resolution, transition scoring (harmonic, tempo, energy), and setlist/export endpoints. The post is partly a walkthrough and partly a promotion for the FreqBlog API.

  • •Uses FreqBlog API endpoints for transition scoring and setlist generation
  • •Transition score blends harmonic compatibility, tempo proximity, and energy smoothness
  • •Includes code for resolving track names to catalog IDs and building ordered sets

Generated with AI, which can make mistakes.

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