>>11243276"Nasality" is a broad and largely negative phenomenon of a singer struggling with high notes, with their voice losing power or clarity, becoming muffled and dull. I refrain from using the term in this sense (I'd just talk about clarity), but it is popular. For instance, Sora and Irys suffer from it when singing Homura. Compare it with Hachi who retains power and clarity in her voice.
Note that people sometimes use "nasal" to describe bright and squeaky voices, like in Mumei and Shiki Miyoshino's singing, or country music. What they mean is "twang", and this is more about what happens in the throat instead of the nose. Twang is not a negative thing. It makes your voice brighter and louder, and is different from nasality.
Chest & head voices can be used to describe 2 things: pitch (head = higher register, chest = lower register), or the thickening of the vocal folds (head = lengthener-dominant, chest = shortener-dominant). Because of the confusion, I refrain from using head / chest, but they are popular terms.
Shortener-dominant singing sounds full-bodied and impactful (with more pronounced vibrato), while lengthener-dominant singing sounds airy and thin. It is not binary but a spectrum. Okayu is an example of a lengthener-dominant singer, while Hachi is shortener-dominant (compare their live covers of Kimi no Shiranai Monogatari, when they sing "nakanaide" at 2:48). Falsetto voice is when a singer becomes 100% lenghthener-dominant in the high register (like the opening of Sunflower - Malone).
Tell me if the explanation is clear.
