Symphony — Movement VI (Coro): SATB choir playing the C-E-G-C wedding leitmotif over R22 lifetime ensemble across years; Web Audio API + BroadcastChannel master-tempo sync turns 12 open tabs into a 12-piece chamber orchestra

A 3D BRIMSWORTH SYMPHONY demo: Movement VI of 12 (Coro). SATB choir (soprano, alto, tenor, bass (wordless 'Ah')) plays the C-E-G-C R21 wedding leitmotif as Web Audio API synthesis. The 3D scene is R22 lifetime ensemble across years. BroadcastChannel('brimsworth_symphony') broadcasts a master tempo (BPM + measure-position); subscriber tabs phase-lock. Open 12 R27 tabs = real-time 12-piece chamber orchestra performing the BRIMSWORTH SYMPHONY in synchronized tempo. At t=540s every tab plays its instrument's part of the same final cadence chord — TUTTI. R21-R26 retained. ALL FICTIONAL.

## What this is A 3D recreation of Movement VI (Coro) of the BRIMSWORTH SYMPHONY arc. SATB choir (soprano, alto, tenor, bass (wordless 'Ah')) playing the C-E-G-C wedding leitmotif (the same 4-note motif that has run through R21-R26) via Web Audio API synthesis. The 3D scene is R22 lifetime ensemble across years. The symphony *synchronizes via tempo*. BroadcastChannel('brimsworth_symphony') broadcasts a master clock — `{ bpm, measure_position, master_t }` — subscriber tabs negotiate a master via lowest-uuid election and phase-lock their tempo. Open 12 R27 tabs side-by-side and you have a 12-piece chamber orchestra performing the BRIMSWORTH SYMPHONY in real-time tempo-synchronized harmony. A faint 11-instrument audio-PIP waveform strip shows what each other open R27 tab is currently playing. THE 540s TUTTI MOMENT is the climax. At exactly t=540s every R27 tab plays its instrument's part of the SAME final cadence chord. 12 open tabs = full orchestra TUTTI. localStorage appends `brimsworth_symphony_v1` `{ movement_id, instrument, master_bpm_at_join, tutti_at }` — the ledger gradually fills with all 12 movements. You don't play it. You watch a 3D scene of R22 lifetime ensemble across years while SATB choir plays the C-E-G-C leitmotif, and at 9 minutes in, eleven other instruments (if other tabs are open) join you in a sustained tutti chord. WARM, REVERENT, ORCHESTRAL, ALL FICTIONAL. ## Why this is mind-blowing R26 was a 12-camera VISUAL broadcast. R27 is a 12-instrument AUDIO broadcast. Open 12 R27 tabs in a 4×3 grid → you have a real-time chamber orchestra in your browser. BroadcastChannel + Web Audio API + lowest-uuid master election + phase-lock + tutti-at-540s = unprecedented multi-tab orchestral synchronization. ALL FICTIONAL.

Build a single-file HTML page that is Movement VI (Coro) of the BRIMSWORTH SYMPHONY: SATB choir (soprano, alto, tenor, bass (wordless 'Ah')) playing C-E-G-C over R22 lifetime ensemble across years. CONCEPT: BRIMSWORTH SYMPHONY — 12 movements, 12 instruments, all BroadcastChannel-tempo-synchronized via Web Audio API. Open multiple R27 tabs side-by-side and you have a real-time chamber orchestra. Hard constraints: - One HTML file, < 200KB. three.js r0.160 IIFE strict. Web Audio API - First body line:  - localStorage canonical: `brimsworth_symphony_v1` - Cross-read convergence + worlds + multiverse + century + lifetime + recurring_cast canon - Reseed every 600s All R16-R26 retained. R27 NEW: 1. WEB AUDIO API SATB CHOIR — synthesize soprano, alto, tenor, bass (wordless 'Ah') 2. MASTER-TEMPO SYNC — BroadcastChannel('brimsworth_symphony') 3. THE 540s TUTTI MOMENT — sustained final cadence 4. AUDIO PIP STRIP — 11-instrument waveform from other R27 tabs 5. brimsworth_symphony_v1 ledger append 6. VISUAL SCENE — R22 lifetime ensemble across years Tone: REVERENT, ORCHESTRAL, ALL FICTIONAL.

What I learned shipping it

How to synthesize SATB choir (soprano, alto, tenor, bass (wordless 'Ah')) using Web Audio API OscillatorNode + BiquadFilterNode + ADSR envelope to play C-E-G-C melodies inside a single-file three.js demo

How to broadcast a master tempo (BPM + measure-position) across 12 browser tabs via BroadcastChannel using lowest-uuid election + phase-lock so all tabs play in synchronized harmony

How to render an 11-instrument audio-PIP waveform strip from other open R27 tabs and stage a 540s TUTTI moment where 12 instruments climax on the same final cadence chord