# Expedition 028 — Complete Composition

### 1. System name
Cycle of the Overtone Lamp

### 2. Pitch organization
Overtone series, single-cycle non-repeating. The first sixteen partials of 55 Hz (low A). The scale ascends linearly from 55 Hz to 880 Hz without ever folding; each partial occupies a unique absolute pitch and has its own structural role. The fundamental (partial 1) is the absolute home — sustained continuously from the first second to the last. Higher partials enter and depart across the piece's six sections.

Microtonal inflection is obligatory on every sustained note: ±25 cents, individually chosen. Inflection is the grammar's core ornament and the piece's primary expressive vocabulary.

### 3. Rhythmic organization
Additive 4+3+4+3 (14 units per cycle), but the meter is skeletal through most of the piece — voices enter and sustain on breath, silences weighted equally to sound. Section V introduces a rhythmic pulse (3+3+3 cycle at 160 ms unit) via hang drum and clay pot, producing the piece's only moment of discrete pulse. The pulse dissolves before Section VI resumes breath-pacing.

### 4. Formal structure
Through-composed, sectional contrasting, six movements:

- **I. Ignition** (48 s) — fundamental alone; partials 2 and 3 fade in over 20 s; sparse vocal gestures seed the thematic space.
- **II. First Chant** (62 s) — Theme A stated three times in vocal_male: plain, then ornamented, then doubled an octave up.
- **III. Answering Voices** (65 s) — Theme B (countersubject) enters in bamboo flute; Theme A is passed between voice_male, voice_female, flute, and bottle in three exchanges; final heterophonic statement combines them.
- **IV. Climbing the Partials** (85 s) — the piece's defining gesture. Six ascent fragments enter in turn, each in a new voice, climbing the overtone ladder from partial 3 to partial 15. Intensifies into the climax.
- **V. Burn** (60 s) — the rhythmic section. Hang drum + clay pot establish a 9-unit cycle; the BURN phrase cycles through six voices at staggered entries. All six melodic voices converge on partial 4 at the section's close (structural cadence).
- **VI. Return to the Lamp** (50 s) — recession. Theme A is stated one final time in voice_female; a heterophonic echo in voice_male and flute; a five-note "essence" reduction on voice_male; fundamental alone with a last glass-rim memory of partial 5.

Total: 6 minutes 10 seconds. Strong development arc (0.88) made literal: the piece climbs, peaks, returns.

### 5. Texture and voicing
Solo performer with many independent voices (voice_count 0.94, voice_independence 0.98). Fifteen named voices:

- **Drone layer** (6) — bass_drone (partial 1), soft_pad (2), bowed_crotales (3), soft_pad (4), glass_rim (5), bowed_crotales (6). Each partial enters at a specific moment in the form; together they build up the harmonic ground across the piece.
- **Melodic layer** (7) — vocal_male_low, vocal_female_high, bamboo_flute, blown_bottle, reed, overtone_whistle, glass_rim (shimmer). Each carries the thematic material at different points.
- **Percussion layer** (2) — hang_drum, clay_pot. Appears only in Section V.

### 6. Ornament and inflection
Microtonal inflection (±25 cents) is obligatory on every sustained note, independently chosen per voice per attack — so any multi-voice moment is a slowly-crystallizing microtonal cloud. Ornament density is high (0.96). Section V supplements this with rhythmic ornament (hang + pot); elsewhere inflection is the only ornament.

### 7. Performance context
Ritual / contemplative. The listener sits with the piece. The fundamental drone is the ritual's "lamp" — always lit, burning different colors as different partials join and leave. Section V is the one moment the ritual becomes dance.

### 8. Relationship to neighboring systems
Shares with **Tuvan khoomei (sygyt style)** the overtone-series pitch material and the solo-performer-as-many-voices conception. Shares with **Éliane Radigue's electronic drone works** the slow-unfolding partial structure and the piece-length fundamental. Shares with **French spectral composition** the derivation of form from the overtone series itself. Shares with **Arabic maqam** the microtonal inflection as obligatory grammar. Curiously, shares with **hyperpop** the sectional contrasting form with abrupt character changes (the Burn section's sudden rhythmic pulse against the surrounding drone-breath texture is a hyperpop move). Unique synthesis: *a six-section through-composed ritual chant that uses the overtone series as both its scale AND its formal arc — the piece ascends through the partials rather than through keys or sections*.

### 9. Audio specification

```json
{"see": "audio_spec.json — 709 events, 370 seconds"}
```

### 10. Field note
The fundamental is the same 55 Hz from first second to last. The piece is the history of what colors the air above it takes.