VII Voice foundations · Chapter 1
How your voice works
Power, vibration, resonance — the three-part system behind every note you sing.
Your voice is an instrument you’ve been playing since you were born — you’ve just never seen it. Voice scientists describe it as a three-part system, and every singing skill you’ll ever learn maps onto one of these parts.
1. The power source: breath
Air from your lungs is the energy supply. When you exhale, air pressure builds beneath your closed vocal folds until it pushes them apart — then they snap back together, hundreds of times per second. No air, no sound. Weak or uncontrolled air, weak or uncontrolled sound.
This is why breathing gets its own chapter (and its own interactive exercise) in this course. It isn’t a warm-up formality — it’s the engine.
2. The oscillator: vocal folds
Inside your larynx (the “voice box” behind your Adam’s apple) sit two small folds of muscle and membrane. When air passes between them while they’re gently closed, they vibrate — about 110 times per second for a typical male speaking note, around 220 for a typical female one, and much faster for high sung notes.
Faster vibration = higher pitch — exactly the rule you met in the very first theory chapter. Your vocal folds change pitch by stretching (thinner, faster, higher) and relaxing (thicker, slower, lower), the same physics as a guitar string.
3. The resonator: your vocal tract
The buzz the vocal folds make is, on its own, thin and unimpressive. What turns it into your voice is everything above the larynx: throat, mouth, and nasal passages. This air-filled tube — the vocal tract — amplifies some frequencies and dampens others, the way a guitar’s wooden body shapes the string’s buzz into a guitar sound.
Change the shape of the tube (drop your jaw, raise your soft palate, shift your tongue) and you change the sound — brighter, darker, more open, more focused. Vowels themselves are just resonance shapes: ee and ah use the same vocal-fold buzz filtered two different ways.
Why this matters for learning
Almost every vocal instruction you’ll ever hear targets one of the three parts:
| Instruction | System it targets |
|---|---|
| ”Support the note” | Power (breath) |
| “Don’t reach for the high note” | Oscillator (fold tension) |
| “More space, drop the jaw” | Resonator (tract shape) |
When something sounds wrong, diagnosing which system is misbehaving is half the fix. That mental model — power, source, filter — is the foundation everything else in this course builds on.
Recap
- Your voice has three parts: breath (power), vocal folds (vibration), and vocal tract (resonance).
- Pitch comes from how fast the folds vibrate; they stretch to go higher — same physics as a string.
- Vowels and tone color are resonance shapes, made above the larynx.
- Every technique instruction targets one of the three systems — knowing which one helps you fix problems instead of guessing.