Voice production in singing and speaking, based on scientific principles

by Wesley Mills

. Beyond this point there is closure of the cartilaginous glottis. Sometimes the whole glottis is open throughout.

2. In barytone voices the whole glottis is often open to

, and occasionally to

. Beyond this point the cartilaginous glottis is closed, except in rare cases.

3. In bass voices the whole glottis is sometimes open to

. Beyond this point, except in a few instances, the cartilaginous glottis is gradually closed.