See the full rack
Five synth lanes — Helix, Vocal, Keys, Drums, Band — with scroll-linked copy and live API proof. Same engine behind chords.thiri.ai and the MCP server.
Open Studio Rack →No install · in your browser
Same deterministic harmony behind chords.thiri.ai and the MCP server — hear it, shape it, export MIDI. Built by Blues Prince Media.
Building an app or agent? Read the API docs · Get a free key
Live now
Five synth lanes — Helix, Vocal, Keys, Drums, Band — with scroll-linked copy and live API proof. Same engine behind chords.thiri.ai and the MCP server.
Open Studio Rack →Scroll through a real lattice export — Cmaj7 | Am7 | Dm7 | G7 with snap-stop theory cards. Same LatticeFrame[] THIRI ships for MCP.
Toggle reharmonization techniques on a progression and hear the structure change — computed, not generated.
Open Future →Describe a musical vibe in words. THIRI arranges a four-piece band with harmony, bass, drums, and more.
Open Conductor →Voice-led paths across your changes — every note legal, every performance reproducible from seed + tempo.
Open Helix →Real-time harmony voices — the musician-facing surface of the engine.
Open Harmonizer →More from the lab
Band studio, drum sequencer, keys sequencer, and more — all on Innovate at build.thiri.ai.