The cricothyroid muscle in comparision to a tuning peg of a guitar

Vocalization is similar in the sense that, playing musical instruments is like a sport. Breathing and physical strengths as well dedication and practice are needed for both. When singing your voice is your own unique instrument and needs a sense of understanding and control of its mechanics.
Let me compare the cricothyroid muscle mechanics to that of a tuning peg of a guitar.
The cricothyroid muscle begins by contracting, to bring closeness between the top of the cricoid cartilage and the bottom of the cricoid cartilage in order to then move the cricothyroid articulation. Next, the anterior commissure of the thyroid cartilage becomes longer to strain the vocal fold which finally produces the high-register.
Compared to a guitar’s tuning process, the cricothyroid muscle can be seen as the tuning pegs of the guitar. The tuning pegs of a guitar stretch and strain strings for a higher tuning pitch. Less stretching and tension for lower sounding strings. The tuning pegs hold the strings down steady to keep consistent and smooth sound pitch production from the strings.
If you wind the peg more and more tight, the strings undergo an increase in tension and have the ability to make a high-register sound.

Gitarre im Detail

2

Note1:The above figure mentions a total four cricothyroid articulation movements contracting to pull up the cricoid cartilage and extend/stretch the vocal cord to make the high-register.
The two arrows show you the severity of the force. The degree of force is displayed by its size. For example, the larger arrow has more force.
The cricothyroid muscle contracts, and the cricoid cartilage moves ↑ which is the bigger arrow.
The larynx is suspended by the stylopharyngeus muscle and the stylohyoid muscle, that moves ↓ just a little bit.

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How to relax when you let out a high-pitched voice

You can let out a high-pitched voice easily when practicing, if you do rock-paper-scissors at the same time. The sequence of the hand motions don’t have to be exact or in sequence, mix it up. Multitasking with your hands while singing will ease being tense by keeping the mind and body busy.
Many people are afraid and say that, “singing in a high-pitched voice is really difficult.” These negative feelings toward that aspect of singing can psychologically influence your sound production by hardening your larynx and body, which will in turn disrupt your performance in letting out the high-pitched voice. Both physical and mental strengths are necessary for good vocalization.
If you already have the skill to be able to let out a high-pitched voice, just stop extremely concentrating/focusing in letting out the high-pitch voice, and you would be able to let it out easier.

Note1: However, if you on focus playing rock-paper-scissors more than vocalizing, your singing will be messed up. So, please don’t be extreme, think too much, or overdo it.