Play · Csound WASM · THIRI API

Conductor

Type a musical direction; THIRI arranges a four-piece band and plays it in the browser.

0 / 50 XP Passport

30 seconds

Type "slow gospel in Bb, 8 bars". Press conduct. Download the MIDI.

Type a musical direction. THIRI arranges a four-piece band (harmony keys, a second keyboard, bass, drums) and plays it here, synthesized in your browser by Csound. No key needed to play: this page uses the site's shared key. Paste your own for unlimited plays.

Audio is synthesized in your browser by Csound using THIRI's own instruments. The first Play loads the engine (a few MB) — give it a second. No key yet? Get a free one at build.thiri.ai/keys, then add the MCP (npx @bluesprincemedia/thiri-mcp) — or browse published research.

Challenges

Conduct a band +10 Get any arrangement playing.
Transpose by talking +15 Ask for the same thing in a different key.
Into the DAW +25 Download the MIDI.

Under the hood

THIRI calls: /v2/conduct (via the site play proxy, or your own key)
MCP Tools: conduct_band generate_voicing MCP Docs & Playground →
Inputs: keyboard, mouse
Source: src/pages/innovate/conductor.astro + src/lib/conductor-csound.mjs
Key needed: No. The page uses a site key or the in-browser engine.

Sample request

{
  "prompt": "4-bar swung loop in F for piano, bass and drums"
}

Response

{
  "conductor": {
    "tempo": 80,
    "key": "F",
    "bars": 4,
    "swing": 0.55,
    "groove": "straight"
  },
  "lanes": [
    "harmony",
    "pattern",
    "bass",
    "drums"
  ],
  "leadSheet": "| Gm9 | C13 | Fmaj9 | Fmaj9 |",
  "midiBase64": "TVRoZAAAAAY…"
}

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Allow the mic, hold a note, pick a chord. Hear the stack.