The original title is "Harmonic mixing over MCP: the DJ set-builder Spotify never shipped"

Short summary

FreqBlog launched a DJ set-builder API that goes beyond replacing Spotify's deprecated endpoints — it adds pairwise transition scoring and full setlist ordering around the Camelot wheel. The entire surface is exposed as an MCP server, letting LLMs and agents plan DJ sets by calling tools directly without glue code. The post covers the harmonic-mixing model, REST endpoints, and MCP tool interfaces with concrete examples.

• •FreqBlog rebuilt Spotify's deprecated Audio Features, Recommendations, and Related Artists endpoints with drop-in compatibility
• •A novel set-builder scores pairwise track transitions using Camelot key compatibility, BPM proximity, and energy smoothness
• •The full API surface is exposed over MCP, enabling LLM agents to plan DJ sets via direct tool calls

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