# Expedition 005 ### 1. System name Walking Drone Imitation ### 2. Pitch organization Eleven pitches generated by successive powers of 2^(1/π) above a reference of 90 Hz: approximately 90, 112, 140, 174, 217, 271, 338, 421, 525, 655, 817 Hz. The ratio is irrational; the series spirals outward without closing on any interval. Interval hierarchy is absent — no pitch serves as a tonic, and the reference pitch is distinguished only by being the lowest. Microtonality is intrinsic: the intervals between adjacent pitches are small enough that a Western ear perceives microtonal space throughout. Pitch flexibility is low — once a pitch is learned, it is produced without bending; its microtonal character is a property of the scale itself, not of performance inflection. ### 3. Rhythmic organization Breath-based. The soloist sets the pace by walking, and breathes according to the terrain — faster on ascending paths, slower on level ground, paused at features that warrant attention (a river, a boulder, the top of a ridge). The accompanying voices are bound to the soloist's breath, entering and leaving their pitches in response to the soloist's inhalations. No pulse is maintained. Tempo drifts continuously with the topography. ### 4. Formal structure Cyclical return. A performance traces a known path from one landmark to another, and then returns along the same path. The return is not an exact repetition — it proceeds in the opposite direction through the same features, producing a palindromic form. Full performances run from twenty minutes (short paths) to several hours (multi-ridge walks). The cycle-length maps directly to path length. ### 5. Texture and voicing Soloist with accompaniment. One lead voice (or occasionally an instrument — a notched flute, a single-stringed bow) carries the melodic content. Two or three accompanying voices hold a layered ostinato drone built from the lowest pitches of the set. Drone presence is nearly constant; the drone voices swap which of them is sounding to allow breathing, so the drone itself never breaks. ### 6. Ornament and inflection Microtonal inflection is core but static — the inflection is not performed, it is built into the scale. Ornament is otherwise sparse: the soloist may hold a pitch longer at a geographic feature, or pair two adjacent pitches in a slow trill when approaching a water crossing, but these are local responses to terrain, not schematic ornaments. ### 7. Performance context The system is a contemplative personal practice that happens to occur in company. The soloist walks a known path and the accompanying voices walk with them, singing and playing. Participation is expected of any walker who knows the path; there is no audience distinct from the participants. Transmission is environmental-imitative: students learn not by teacher demonstration but by walking the path with experienced practitioners and gradually imitating what they hear — the pitches are understood to have been themselves imitated, originally, from environmental sounds encountered on the path (the specific pitch of a wind-in-reeds, the specific register of a water-fall at a certain season). ### 8. Relationship to neighboring systems Sits between Hindustani khayal (drone-based, improvisatory, soloist with accompaniment, microtonal) and Aboriginal song cycle (geographic mapping, ritual duration, environmental grounding). Shares the drone-as-foundation of the Indian classical tradition but replaces the khayal's vocal flexibility with a fixed microtonal scale. Shares the geographic-mapped form of Aboriginal song cycles but replaces their through-composed narrative with a palindromic cyclical return. Diverges from both in its breath-and-terrain-driven tempo and in transmission through environmental imitation rather than teacher-student lineage. ### 9. Audio specification ```json { "duration_seconds": 80, "pitch_system": { "encoding": "ratio", "reference_hz": 90, "pitches": [1.000, 1.247, 1.554, 1.938, 2.416, 3.012, 3.755, 4.682, 5.837, 7.278, 9.075], "octave_repeats": false, "inflection_rules": [ {"pitch_index": 0, "inflection_cents_range": [-8, 8], "direction": "both"}, {"pitch_index": 1, "inflection_cents_range": [-8, 8], "direction": "both"}, {"pitch_index": 2, "inflection_cents_range": [-8, 8], "direction": "both"} ] }, "rhythm_system": { "type": "breath_based", "breath_count": 18, "breath_duration_range_seconds": [3.5, 7.0], "between_breaths_seconds": [0.5, 1.4] }, "voices": [ {"name": "drone_low", "timbre": "vocal_male_low", "pitch_indices": [0], "rhythm_role": "sustained_drone", "amplitude": 0.55, "spatial_position": [-0.4, 0.0]}, {"name": "drone_mid", "timbre": "vocal_male_low", "pitch_indices": [1], "rhythm_role": "sustained_drone", "amplitude": 0.45, "spatial_position": [0.4, 0.0]}, {"name": "soloist", "timbre": "reed", "pitch_indices": [3, 4, 5, 6, 7, 8, 9], "rhythm_role": "breath_phrase", "amplitude": 0.75, "spatial_position": [0.0, 0.3]} ], "form": { "arc_type": "cyclical", "sections": [ {"name": "outward_1", "start_seconds": 0, "duration_seconds": 18, "character": "soloist ascends through the set, breath slowing"}, {"name": "apex_1", "start_seconds": 18, "duration_seconds": 8, "character": "held pitches at the path's highest point"}, {"name": "return_1", "start_seconds": 26, "duration_seconds": 18, "character": "soloist descends; breath relaxing"}, {"name": "outward_2", "start_seconds": 44, "duration_seconds": 16, "character": "second traverse — variations on the first"}, {"name": "apex_2", "start_seconds": 60, "duration_seconds": 6, "character": "apex held longer this time"}, {"name": "return_2", "start_seconds": 66, "duration_seconds": 14, "character": "final descent; drone only at end"} ] }, "ornamentation": { "density": 0.35, "rule": "Soloist pairs two adjacent pitches in a slow alternation when transitioning between sections. Otherwise pitches are held plainly." } } ``` ### 10. Field note By the second traverse, the drone has been in the room long enough that it seems to be coming from the walls — the soloist's pitches arrive like things noticed on a return walk, familiar but placed differently.