The science of humming

The vocal cord is vibrating when humming.
I’ve observed the vocal cord vibrating when a singer is humming precisely.
The process of humming is the action of when closing your mouth, the air and sound waves travel to go through the nasal cavity. The sound then vibrates in the soft palate and the nasal cavity.
Note:The sound is made by vibrating air, which cannot make a sound without an exit for the sound.
So, even if you close your mouth, the air goes out through the nose. If you close both mouth and nose, you cannot make the sound.
In the case of humming, the sound is made by using nasal cavity, which consists of (1) a narrowed resonance chamber (2)lengthening the resonance chamber (3)a decrease in exhaled air.

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Obesity and the voice (pertaining to pitch and range)

It’s not true that if you are overweight that your voice pitch is low. The vocal fold is composed of soft tissues, therefore if the vocal cord gets heavy and the voice does become low it is due to the tissues having more fat.
However, please know that body type does not relate to the voice’s ability. A lot of great singers who are obese can extend or contract the vocal cord easily, and have varied ranges of pitch.
The above reasons pertaining to the the amount of soft/light and hard/heavier tissues are factors of determining voice pitch.
The condition of voice changes in association with the body type, but the voice pitch depends on a lot of individual factors.

Note1: Swollen vocal cords are also a reason to cause the voice to be low. This is because the space is narrowed between the thyroid cartilage and the hyoid bone, which obstructs blood circulation.

Impossible to vocalize by using false vocal cord (Death voice)

The false vocal cord means that’s the vestibular fold, which is located on the upper side, has no muscle actually but is able to move by itself.
It’s not possible to vocalize by the false vocal cord. If you have a large false vocal cord, for example if the false vocal cord condition is swollen or the erosion of vestibular folds, then production of vibrating sounds associated with the false vocal cord are mixed with sounds from the authentic vocal cords. This mixed sound is recongized and classified as a double sound or extreme low sound.
I’ve heard that you need to use the false vocal cord for making a death metal voice, I cannot confirm or deny this. However, I do understand and can explain the mechanics process of such a voice’s sound in that genre.

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Note1:In the case of a death voice, you have to vibrate the sounds from the vocal cord in the soft tissues of the throat. These vibrations should travel to cover the vestibular fold, the epiglottis, the palatine uvula, and/or the tissues around the epipharynx.

Note2:For acquiring the death voice, you need flexible tissues in the throat and space in the area of the back of the tongue.

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Note3:It is possible to move the vestibular fold, because it is located near the vocal fold and it is moved together in conjunction with the vocal cord muscles.

Maria Callas had LDP?

Maria Callas is an opera singer who I’ve listened to and watched sing millions of times so far.
As a result, I’ve found out and understand the mechanics of her throat.
Her larynx was moving and had great flexibly in the early stages of her singing career, but her larynx got in deep after around 1960 and her voice changed. The larynx’s deep position impacted negative changes in her voice, regarding flexibility and control.
The characteristics of her larynx from the early to latter stages of her opera career are as follows:
1:Her thyroid cartilage was bigger when compared to other soprano singers. She could produce a loud rich voice, but often displayed it was a challenge and took extreme effort to control her throat muscles due to a heavy larynx.

2:The shape of her larynx was a normal shape around the top but noticibly wider around the bottom. Due to this widened shape, she could extend to a wide range of vocal tones. The vocal fold was also enlarged.

3:The movement of the hyoid bone was smooth and flexible. The pharyngeal cavity was a large size, enabling her to control sound easily.

4:The movement of larynx had then changed, and her voice became boxy. Problems with letting out a high register due to LDP could easily be noticed when she had a bad condition.

5:The movement of the musculus extrinsic laryngis was sometimes not stable in reference to control by both the physical and mental states.

6:The omohyoid muscle sometimes rose to the surface and the larynx got in deep which directly interfered with its ability to move.

7:The movement range of cricothyroid articulation was increased. The cricoid cartilage was large and she was able to sing loud high-registers, but when she had LDP she had a cough.

8:Her collarbone connecting to her chest moved very well and taking breaths as well as breathing were above average.

9:Her jaw joint did not work so well, and sometimes delayed in letting out the voice.

As described in the above investigation, you can determine that she had LDP. Please compare and observe this information when listening her voice.