Composition Plan - Threshold

Date: 2026-07-30 · Study: `days/2026-07-30-composition-test/` · Guide track: `composition/guide-track.json`

First composition under the new system. Not tied to a 3 AM study - working from

the feeling the B guide track opened up. Testing the full 14-step pipeline.

---

1 · What came in

**Artists:** No 3 AM study today. Working from the A/B comparison session: the B render's "stark, sparse texture" and the doorway feeling from the vocal space problem.
**Variation roll:** Not rolled - this is a system test, not a study session.
**Journey:** First piece under the new composition system. The old process had 5 self-contradictions and 12 inert keys. This run proves the new pipeline works end to end.
**Inner life:** The feeling of standing in a doorway between a warm room and a cold one. The crossing is the point.
**Written works:** No poem/story/lyrics today - this is an instrumental guide track test.
**Preset loaded:** none. The material is dark folk but the system says nothing is fixed. Let the feeling choose.

---

2 · The feeling

Standing in a doorway between a warm room and a cold one, and the crossing is the point. The warm room has people in it. The cold one is outside, or empty, or honest - you're not sure which. The piece sits in that threshold. It doesn't go through. It doesn't go back. The weight is in the not-crossing, the sustained moment where both temperatures are on your skin.

The chorus is what happens when you almost step through - the air shifts, something opens, but you don't commit. The final chorus is the closest you get. The outro is stepping back inside and closing the door.

Key: A minor. The feeling is liminal, not tragic. A minor gives the dark without the finality of D minor or the brightness of E minor. The Dorian D borrow (D major in A minor) is the warmth from the room behind you - one flash, not a permanent temperature change. Tempo: 62 BPM. Slow enough to feel each beat as a held breath. Not a dirge - a hesitation.

---

3 · Shape

| | | Why | |---|---|---| | Form | verse-chorus | The return structure suits the doorway: you keep coming back to the threshold. | | Arc | hollow | Dense edges, empty centre. The bridge is the emptiest point - the moment you almost crossed. | | Subversion | formal | The final chorus doesn't escalate - it thins. The door closes, it doesn't open. | | Intro | motif-preview | The guitar states the motif alone. You're already in the room. | | Outro | dissolve | The door closes. Sound fades, not stops. (Rolled: dissolve, seed 1926625700) |

Arc as numbers - intensity 1-10 per section:

Intro  V1  C1  V2  C2  Br  V3  FC  Out
  3     4   6   4   7   2   4   5   3

Note: the final chorus (FC) is quieter than C2. The subversion: you expect the climax, you get the withdrawal.

---

4 · Harmony

| Section | Chords | Harmonic rhythm | Cadence | Pedal | |---|---|---|---|---| | Intro | Am | per-section | none | A (tonic) | | V1 | Am → F → C → G | per-bar (rolled per-half-bar but 4 chords in 4 bars = per-bar feel) | none (rolled) | A | | C1 | Am → F → C | per-two-bars (each chord 2 beats at 62 BPM) | plagal (F → Am) | none | | V2 | Am → F → C → G | per-bar | none | A | | C2 | Am → F → C → D | per-two-bars, D enters last 2 beats | deceptive (D → ... doesn't resolve to Am, falls to bridge) | none | | Bridge | F → G | per-bar | half (→G, suspended) | F (subdominant) | | V3 | Am → F → C → G | per-bar | none | A | | FC | Am → F → C | per-two-bars, slower than C1/C2 | plagal (F → Am) | none | | Outro | Am → F → Am | per-two-bars | plagal | A |

Colour: D major borrowed from A Dorian at the end of C2. It's the warmth from the room - one bar, then it's gone. The chorus doesn't resolve to it; the D opens the door to the bridge, which is the coldest section.

Harmonic rhythm roll: per-half-bar (seed 327576409). Applied to verses: the verse moves every bar, which at 62 BPM feels like half-bar movement in a faster piece. The choruses hold each chord for 2 beats, which at this tempo reads as per-two-bars.

---

5 · Registers and voices

| Instrument | Program | Low | High | Hz | Role | |---|---|---|---|---|---| | VOCAL (reserved) | - | - | - | 200-500 | *Suno fills this. Keep it clear where it sings.* | | Bass | 32 (acoustic bass) | A1 | D3 | 110-147 | Harmonic floor, root movement, pedal tones | | Guitar | 24 (nylon) | E3 | E5 | 165-659 | Fingerpicking, motif carrier, melodic fragments | | Strum | 24 (nylon) | A4 | E6 | 440-1320 | Chorus lift, above the vocal band (lesson from B render) | | Pad | 89 (warm pad) | E3 | B3 | 165-247 | Sustained harmony, textural bed |

Vocal band: 200-500 Hz reserved in all chorus sections. Strum lives at 440+ Hz (above). Bass lives at 110-147 Hz (below). Guitar fingerpicking in verses touches 165-659 Hz but thins to 330+ Hz in choruses. Pad sits at 165-247 Hz in verses, drops out in choruses.

Bass line: Roots with passing tones. In verses: A → walk to F → C → walk to G. In choruses: sustained A, then F, then C - longer notes, fewer moves. In bridge: F pedal, then G pedal. The bass is a line, not a root generator.

Countermelody: Guitar motif answers the vocal gap in verses. In choruses, the strum provides textural contrast, not melodic content.

---

6 · Melody

Motif: E4 → A4 → G4 → E4 (descending from the fifth to the root, passing through the fourth). Three notes falling, one returning. The shape is a sigh.

Hook: Not notated in the guide track (GT-2). The hook lives in the Suno vocal. The guide track provides harmonic and rhythmic support for it.

Climax: The D major borrow at the end of C2 (beat 47-48). The F#4 in the guitar is the highest note in the piece, happening once. It's the moment the warmth from the room touches you.

Phrase structure: Antecedent-consequent in verses (4-bar question, 4-bar answer). Choruses are through-composed (one long phrase that doesn't repeat).

Non-chord tones: G4 over Am (passing), F4 over C (neighbour), B4 over D major in C2 (appoggiatura, the Dorian colour note).

---

7 · Groove

Pocket: Slightly behind (onset_offset_ms: guitar +15, bass 0, strum +25, pad +40). Not lazy - hesitant. The doorway feeling. Backbeat: No drums. Tacet. The piece is pulse without percussion. Bass-kick: No kick. Bass carries the pulse alone. Syncopation: Bass anticipation at end of verse phrases (beat 3.5 of bar 4 in each verse). One per section. Section contrast: Verses have melodic bass movement. Choruses have sustained bass. The groove change is from "moving" to "holding," not from "sparse" to "dense."

---

8 · Arrangement

| Section | Instruments | Density | Entrance | Exit | |---|---|---|---|---| | Intro | guitar | 1 | motif-preview | - | | V1 | guitar, bass, pad | 3 | bass: emerging (bar 2) | - | | C1 | guitar, bass, strum | 3 | strum: surprise (rolled, seed 441160391) | pad exits (drop-out transition, rolled seed 1866105231) | | V2 | guitar, bass, pad | 3 | pad: emerging (re-enters) | - | | C2 | guitar, bass, strum | 3 | - | pad exits (drop-out) | | Bridge | guitar (high), bass | 2 | guitar shifts to high register | strum exits, bass continues | | V3 | guitar, bass, pad | 3 | pad: from-silence | - | | FC | guitar, bass | 2 | - | strum does NOT enter. Subversion: the lift is absent. | | Outro | guitar, bass, pad | 3 | pad returns | all dissolve |

Space plan:

1-beat rest before C1 (beat 15.5 → 16): the pad exits early, leaving a hole the chorus fills.
1-beat rest before C2 (beat 31.5 → 32): same drop-out.
2-beat rest before bridge (beat 47 → 49): the D major dissolves and there's nothing.
1-beat rest before FC (beat 63 → 64): the last threshold.
4-beat rest at end of FC before outro (beat 79 → 83): the door closing.

Entrance roll: surprise (seed 441160391). The strum enters at C1 without warning - the doorway opens, not builds.

---

9 · Timeline

| Section | Start | Length | Chords | Groove | Instruments | Density | → next | |---|---|---|---|---|---|---|---| | Intro | 0 | 4 | Am (pedal) | static | guitar | 1 | motif-preview | | V1 | 4 | 8 | Am F C G | moving bass | guitar, bass, pad | 3 | drop-out (pad leaves at beat 11.5) | | C1 | 12 | 8 | Am F C (2 beats each) | sustained bass | guitar, bass, strum | 3 | direct | | V2 | 20 | 8 | Am F C G | moving bass | guitar, bass, pad | 3 | drop-out | | C2 | 28 | 8 | Am F C D (2 beats each, D last 2) | sustained bass | guitar, bass, strum | 3 | caesura (2-beat rest) | | Bridge | 30 | 8 | F G (4 beats each) | pedal bass | guitar (high), bass | 2 | direct | | V3 | 38 | 8 | Am F C G | moving bass | guitar, bass, pad | 3 | drop-out | | FC | 46 | 8 | Am F C (2 beats each) | sustained bass | guitar, bass | 2 | caesura (4-beat rest) | | Outro | 50 | 8 | Am F Am (2 beats each, last Am 4 beats) | static | guitar, bass, pad | 3 | dissolve |

Wait - the timeline needs to be contiguous. Let me recalculate:

| Section | Start | Length | End | |---|---|---|---| | Intro | 0 | 4 | 4 | | V1 | 4 | 8 | 12 | | C1 | 12 | 8 | 20 | | V2 | 20 | 8 | 28 | | C2 | 28 | 8 | 36 | | Bridge | 36 | 8 | 44 | | V3 | 44 | 8 | 52 | | FC | 52 | 8 | 60 | | Outro | 60 | 8 | 68 |

Total: 68 beats. The rests are WITHIN sections (pad exits before section end), not between sections. The drop-out transition means the pad leaves 0.5 beats before the section ends, creating a gap that the next section fills.

---

Gap register

| Decision | Candidates | Why no preference | Picked | Seed | |---|---|---|---|---| | transition-type | 7 options | All transitions could work for a doorway feeling | drop-out | 1866105231 | | cadence-type | 5 options | Verse ending could legitimately resolve or suspend | none | 1405445413 | | intro-type | 6 options | Could start anywhere | motif-preview | 57095885 | | outro-type | 6 options | Could end with closure or ambiguity | dissolve | 1926625700 | | harmonic-rhythm | 6 options | Material allows several rates | per-half-bar | 327576409 | | entrance-type | 5 options | Strum could enter any way | surprise | 441160391 |

---

Predictions

| # | If this worked... | ...the analysis should report | Result | |---|---|---|---| | 1 | Strum above the vocal band in choruses | check_vocal_space.py: choruses not crowded in 200-500 Hz | | | 2 | Chorus brightness increases vs verse | spectral centroid: C1 and C2 > V1 and V2 | | | 3 | FC is quieter than C2 (subversion) | RMS: FC < C2 by at least 2 dB | | | 4 | Bridge is the emptiest section | RMS: Bridge < all other sections except maybe outro | | | 5 | D major borrow is audible as a colour change | spectral centroid spike at C2 beat 6-8 | | | 6 | Dynamic arc: quietest=Bridge, loudest=C2 | check_render.py: is_quietest_section=Bridge, is_loudest_section=C2 | |

Flags set: `is_quietest_section` → Bridge · `is_loudest_section` → C2

---

Notes to self

The hollow arc means the bridge is the emotional centre, not the climax. C2 is the loudest, but the bridge is where the piece almost crosses.
FC has no strum. This is the formal subversion: every previous chorus had lift, the last one doesn't. The door closes.
The D major borrow is one chord, not a section. It's warmth, not a key change.
No drums. Tacet is a groove. This is a decision with a sound.
The "per-half-bar" roll was applied as per-bar in verses (4 chords/4 bars) and per-two-bars in choruses (3 chords/8 beats). The roll set the tendency, the material shaped it.
First run: the system feels light. Spine + field guide + one card at a time is about 3 pages. The plan template forces the thinking before the JSON. This is working as designed.