What you are training
Humming on a closed "mmm" is resonance training disguised as a warmup. With the mouth closed, the sound has to travel through the nose and the bones of the face, and singers feel it as a buzz behind the lips and around the nose. That buzz is forward placement, the thing that makes a voice carry without pushing. The scale ascends on purpose: an upward hum ramps the voice into the day rather than winding it down, and it shows you where the buzz fades as the pitch climbs, which is where placement needs work. This exercise plays the reference, you hum along, and it tracks how steady the pitch stays on the way up. Do it once and notice how much easier the first sung note feels afterwards.
How to do it
- Hum gently on "mmm": feel the buzz in your nose and lips.
- Ascend the 5-note scale on each round, moving up by half step.
- Stop when the buzz weakens or the throat engages, that's your current warmup ceiling for the day.
Humming engages resonance without opening the mouth, perfect low-impact start. Ascending direction (not descending) connects the warmup directly to the day's pitch and range work: the voice ramps up into the session rather than winding down before it begins. Descending humming belongs to cooldown.
After this exercise, the plan: The daily plan pairs humming with vowel work next, so the placement you find on "mmm" carries into open sounds.
If singing hurts, stop. Pain, hoarseness, extra effort, loss of range, or repeated throat clearing that lasts more than a day is a reason to see an ENT or laryngologist, or a speech-language pathologist who specializes in voice. It is not a reason to practice harder.