When a note begins to oscillate, you start blowing harder to try to keep the pitch steady. For a brief moment it feels more solid, but it doesn’t last long, and soon the whole phrase is out of control. It’s a natural reaction to try to correct it by getting louder. With some instruments, getting louder means getting more stable. With singing, this is rarely true. Stability comes from proper balance between breath, onset, vowel, listening, and how much physical effort you’re adding.
To demonstrate, choose a pitch from a piano, keyboard, or tuner that feels reasonable for you. Sing it softly for several seconds until you are comfortable, then stop. Now sing it much louder. Try to assess which was easier to hold steady. If the louder note led to tensing the jaw, lifting the chin, tightening the shoulders, or increased air pressure at the onset, then it’s clear the louder volume added challenges instead of stability.
This is particularly true if there is an excess of air. A new singer might draw in a big breath, then forcefully exhale it through the notes, thinking the extra volume will help hold them steady. But too much air often leads to breathiness and instability, making it hard to sustain a note evenly. Slowing down the inhalation and exhaling with more control is often a better approach for both stability and tone quality. You don’t want to hold your breath or be too stingy with it, but treating air pressure as the main way to fix things is usually unhelpful.
Vowels can play a role too. Hold an ‘ah’ on a comfortable pitch. As you sustain the note, pay attention to whether your mouth, jaw, and tongue stay relatively still. Try increasing volume. If your vowel suddenly opens up more, you tighten your jaw, or you raise your tongue, your tone may become unstable. It’s easier to hear the impact of changes in vowels when holding a single sustained note compared to a full lyric line.
Another exercise to try is to record yourself trying the note 2-3 times. It can be hard to tell what happened to the note during the process, so a recording allows you to listen more objectively. What happened to the beginning, middle, and end? Did the pitch stabilize after a shaky onset? Did it climb as you got louder? Did the vowels change or did the timing get uneven because you focused on getting louder? All of these issues are harder to identify when singing, but easier to hear when you’re just listening.
This also applies to songs. If there is one note in your piece that seems to consistently lose focus, break it apart. Isolate that note and work on getting the notes leading to it in order. Start slowly, then work your way back into the song. You can always increase volume later if appropriate, but you want your song to be stable without having to shout. Isolating the problematic part helps prevent you from repeating the same problems over and over again whenever you get there.
The next time you encounter a note you can’t reliably hold, resist the temptation to fix it by singing harder. Dial back to a comfortable volume. Check in on the reference pitch. Pay attention to your breath, jaw, tongue, and vowel. When you have the note in order at a more relaxed volume, you’ll have a much better chance of being able to change it without losing control.