About this exercise
Pure Vowel Sustains
The five pure vowels, ee, eh, ah, oh, oo, are the shapes every sung word is built from, and holding one steady is harder than it sounds. On a long note the jaw creeps, the tongue rises, and "ah" turns into something between "ah" and "uh" without the singer noticing; the listener hears it as a dull or unfocused tone. Sustaining a pure vowel trains the shape to stay put, which is what makes a long note ring instead of fade. This exercise plays a reference pitch, asks you to hold each vowel for a few seconds, and tracks whether the pitch stays centred as the vowel goes on. Pitch drift on a sustain is usually a vowel drift in disguise. Hold each one, keep the shape, and listen for the moment the tone opens up.
How to do it
- Hold each vowel for 4 beats on the reference note:
- ee [i] - eh [ɛ] - ah [ɑ] - oh [o] - oo [u]
- Let the jaw drop on "ah" and "oh".
- Move up a half step and go again.
Every word you sing is built on these five vowels. Get each one clear on its own before you mix them.
What the app listens for
with headphones, your pitch against the note, and the shape of your vowel on lower notes.
What comes next
The daily plan follows pure vowels with vowel modification on scales, the adjustment that keeps the shape open as the pitch rises.
If singing hurts, stop. Pain, hoarseness, extra effort, lost range or constant throat clearing for more than a day? See an ENT or laryngologist, or a speech therapist who works with singers. Don’t practice harder.
What are the 5 "Italian" or "pure" vowels that form the basis of all singing?
ee [i], eh [ɛ], ah [a], oh [ɔ], oo [u]. Note [a], the open FRONT vowel of Italian "casa", not the darker back [ɑ] of English "father": the difference is small on paper and audible in a phrase. Every other vowel is a variation or blend of these five. Italian is the standard teaching language because these shapes are pure, meaning they hold still instead of gliding the way English vowels do.
What is the difference between open and closed vowels?
Open vowels (ah, aw) have a dropped jaw and wide pharynx - more volume, easier to project. Closed vowels (ee, oo) have a higher tongue - more focused, less volume. Great singers balance both.
What is the vowel-formant relationship in singing?
Each vowel has characteristic resonant frequencies (formants). F1 relates to jaw opening (low=closed, high=open). F2 relates to tongue position (low=back, high=front). Trained singers adjust formants to maximize resonance at specific pitches - this is "vowel modification" or "vowel tuning".