Monstamix

About Monstamix

Monstamix uses AI to separate stems, recognize chords, and detect BPM & key from any YouTube music video. Paste a link and get an interactive multi-track mixer with real-time chord display.

How it works

  1. Paste a YouTube URL into the analyzer
  2. AI separates 6 stems (vocals, drums, bass, guitar, piano, other)
  3. Chords, BPM, and musical key are detected automatically
  4. Mix, mute, and solo individual tracks in the browser

Technology

We use Demucs v4 (htdemucs_6s) for 6-stem separation, CREMA for chord recognition, and librosa for BPM/key detection. Stem separation runs on GPU via Modal.com for fast processing.