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PDC — Quick Reference
PDC Quick Reference
Perceive — Diagnose — Contribute
Lead Singer / Bandleader
The Core Loop
PERCEIVE → DIAGNOSE → CONTRIBUTE → PERCEIVE → ...
In practice: slow, deliberate, analytical. Work through each step with notes. In performance: compresses to: hear → feel what's needed → contribute simply → listen again.
The explicit steps build the pattern library. As patterns are installed, the loop becomes instinctive.
The PDC Decision Chain
| Step | Action | Internal Question |
|---|---|---|
| 1 | Do not play immediately | Can I feel the pulse without touching the instrument? |
| 2 | Locate pulse, beat 1, groove feel | Where is the pocket? |
| 3 | Identify bass, form, harmonic center | What is the foundation? |
| 4 | Scan register and density | Where is there room? |
| 5 | Name the energy | What emotional state is this? |
| 6 | Choose one role | Stabilize / Support / Color / Energize / Converse / Contrast / Space? |
| 7 | Enter with simplest useful action | What is the minimum effective contribution? |
| 8 | Listen to the effect | Did it help? What changed? |
Six Perception Channels
| Channel | Fast Question |
|---|---|
| Foundation | What holds this together? (pulse, bass, groove, form) |
| Space | Where is there room? (register, silence, density) |
| Energy | Where is the energy going? (rising, holding, releasing) |
| Role | What role is needed from me? |
| Interaction | Who is communicating with whom? |
| Color | What harmonic color fits without clutter? |
If foundation is unstable, contribute stability before beauty. If texture is crowded, restraint is the highest-value contribution.
The Four Diagnosis Questions
- What is strong already? — Don't duplicate it.
- What is missing? — This is your lane.
- What is excessive? — This is what to avoid.
- What role should I serve? — This turns diagnosis into action.
Contribution Roles
| Role | When | Success Check |
|---|---|---|
| Stabilize | Foundation weak | Groove feels easier to lock |
| Clarify | Harmony/form unclear | Listener can hear movement better |
| Support | Someone else is foreground | Lead sounds better because of you |
| Color | Foundation strong, space exists | Beauty increased, no clutter |
| Energize | Section needs lift | Energy rose without rushing |
| Converse | Musical response invited | Sounds like a conversation |
| Contrast | Music needs fresh perspective | Form or emotion becomes clearer |
| Simplify | Complexity hurting the music | Clarity or feel improved |
| Leave Space | Music is complete | Not playing made the moment stronger |
Diagnosis Decision Tree
1. Can you feel the pulse?
NO → Diagnose Foundation. Do not decorate.
YES ↓
2. Is the texture crowded?
YES → Diagnose Space. Do not add density.
NO ↓
3. What does the energy need?
→ Lift / Hold / Soften / Release?
4. What role is missing?
→ Choose ONE role from the palette above.
5. Choose the simplest tool that serves that role.
6. Contribute → listen → repeat.
PDC + Internal Band
| PDC Diagnoses | Calls | Example |
|---|---|---|
| Weak groove | Rhythm Cells / Blues Root | Simplify and lock a rhythm cell |
| Unclear harmony | TPS | Shells, guide tones, simple triads |
| Empty but stable texture | TPS / Melodic Shapes | Spread triad or short answering phrase |
| Needs emotional truth | Blues Root | Fewer notes, stronger timing |
| Aimless melody | Melodic Shape System | Motif, contour, target tone |
Minimum Effective Contribution
The smallest action that improves the music. Default for supporting and accompanying roles. In a solo or lead voice role, PDC adjusts: use all available tools to state the idea.
Key Vocabulary
- PDC — Perceive, Diagnose, Contribute: the decision loop
- Foundation — the pulse, bass, groove, form that holds the music together
- Space — the available room in register, rhythm, and silence
- Role — the function you serve in this moment
- Minimum effective contribution — the smallest action that helps
- Position — a focused contribution intention for a pass or section
- PDC compression — the process of the explicit loop becoming instinctive
Practice Mantras
Hear first. Find the foundation. Notice the space. Choose one role. Minimum effective contribution. Serve the music before showing skill. Silence counts. After contributing, perceive again.
5-Minute Practice Loop
| Time | Action |
|---|---|
| 0:00–1:00 | Listen only. Find pulse, foundation, space. |
| 1:00–2:00 | Choose one diagnosis and one role. |
| 2:00–4:00 | Play minimum effective contribution. |
| 4:00–5:00 | Write one observation and one next correction. |