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VII Voice foundations · Chapter 4

Warming up

Lip trills, humming, and straw phonation — the science-backed way to start every session.

6 min read

You wouldn’t sprint without warming up your legs. Vocal folds are muscle and delicate tissue too — singing hard on a cold voice is how strain happens. A good warm-up takes five to ten minutes and follows one principle: gentle first, light and small before loud and big.

The semi-occluded secret

The best-researched warm-up exercises all share one trick: they partly block the mouth while you make sound. Voice science calls these semi-occluded vocal tract (SOVT) exercises. Narrowing the exit creates gentle back-pressure in the vocal tract that helps the vocal folds vibrate more easily and with less impact stress — the folds do less work for more sound. It’s the closest thing singing has to a free lunch.

The classic SOVT exercises:

1. Lip trills

Blow air through loosely closed lips so they flutter (“brrr”, like a child imitating a motorboat) and add voice underneath. Glide up and down in pitch. If your lips won’t flutter, support your cheeks with a finger at each corner of your mouth.

2. Humming

Lips closed, teeth slightly apart, sound directed forward — you should feel a faint buzz at the lips and nose. Slide gently around your comfortable range.

3. Straw phonation

Hum through a drinking straw (into the air, or into a few centimeters of water for extra resistance). This is the most-studied SOVT exercise — voice scientist Ingo Titze, who popularized it, recommends it both as a warm-up and as a daily reset for tired voices. Sirens up and down through the straw, five minutes, gentle volume.

A simple daily sequence

  1. 2 min — breathing: a few slow hiss cycles (previous chapter’s pacer).
  2. 2–3 min — lip trills or straw: gentle sirens, low and easy first, gradually widening the pitch range.
  3. 2 min — humming: small five-note slides (do–re–mi–re–do) moving up by half steps through your comfortable middle range.
  4. 2 min — open vowels: the same five-note slides on “ah” or “oo”, still at easy volume.

After that, sing. Notice the difference between a warmed-up first song and a cold one — it’s usually dramatic.

Recap

  • Warm up gently for 5–10 minutes before real singing: light and small before loud and big.
  • SOVT exercises (lip trills, humming, straw phonation) are the science-backed core — they let the folds vibrate efficiently with less stress.
  • Follow the sequence: breath → trills/straw → humming → open vowels.
  • Warm down after heavy singing with soft descending hums.