A model that understands audio can embed a music collection into a space where similar songs sit close together. Interpolating between two songs in that space gives you a path between them, which is a playlist that transitions smoothly.

With llm and the llm-clap plugin, embed your collection ($MC) with the CLAP model. This stores every song and its embedding in a local embeddings.db:

llm embed-multi -m clap songs --files $MC '*'

The llm-interpolate plugin then returns the points between a start and an end song. This makes a 5-song .m3u playlist from PacifyHer.wav to redrum.wav:

llm interpolate songs "PacifyHer" "redrum" -n 5 | jq .[] > playlist.m3u