The larynx and singing well are interrelated. The larynx houses your vocal chords. The vocal chords vibrate a certain amount of times per second for all the different sounds you make. It is an amazing phenomenon. The vocal chords can vibrate hundreds of times in a second while producing a note or pitch.
Some people refer to a raised larynx while singing. A raised larynx is going to make your throat feel tight because it making your throat smaller and incapable of expelling much air when making sound. This is something I try to avoid when singing. I try to lower my larynx when singing and place it farther down the neck line.
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This is allowing my throat to relax more and it opens things up, which produces more air flowing through the vocal chords. More air exhaled through the vocal chords naturally produces more volume of sound and more range depending on the exact position of your vocal chords.
So we want to position the larynx, which houses your vocal chords in the perfect position to match up with the amount of air that is moving through them. Some people say this is the whole secret to singing. When you can match these two things up correctly, you produce the perfect pitch or note and it contributes to vibrato.
You can see that controlling the amount of air flow and your larynx position are critical to becoming a better singer and being able to target specific pitches of sound.
Another thing to keep in mind is that your larynx is producing sound that sounds different to you compared to someone outside of you. You are hearing an inner resonance of sound including chambers inside your head, bones, chest and other places, which is totally different that what people hear outside of you. This is why recording yourself is so helpful as a singer.
The larynx and singing is worth your reading time because it helps you understand why you need to do certain things to produce a specific range of sound.