Follow The Bouncing Voice Box

When a singer has good vocal technique, his larynx should move (float) up and down depending on the sort of singing that he is performing. For instance, his larynx should lower somewhat for strong, lower register, low note, singing, and, by contrast, his larynx should rise to some extent if he is singing falsetto—and there are many variations in between with respect to the vertical movements of his larynx. 

Moreover, certain vowel sounds can influence the vertical movements of the larynx: the "OO" vowel (as in "boot"), for example, can cause a singer's larynx to drop to some degree, as compared to, for instance, the "EE" vowel (as in "beet"), which typically has the opposite result.

In a word, the common notion that the larynx should not move during singing (some would argue even during dynamic singing) is sheer nonsense. Consider this: most voice experts would agree that with a well trained singer, his tongue should lower to the floor of his mouth (and have a groove that defines its middle from back to front) for certain vowel sounds, like the "AH" vowel, for instance (this is especially true when the "AH" vowel is sung strongly on a low note). 

Well, it's a fact of voice biomechanics that when the tongue is depressed in the manner just described, the larynx lowers as well! So much for the unmoving larynx! The idea of a motionless larynx during singing is just another misleading—even destructive—myth in the endlessly mythological world of voice instruction.

Image source: Everett Collection/Shutterstock