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as we all should know, we use our vocal folds when we sing/talk, stretching and/or expanding for certain sounds and such. when you do vibrato, the vocal folds in your larynx are controlled by muscle which stretch onto the (in lamest terms) jaw of your mouth, so it would cause a reverberating motion to the muscle that surrounds your mouth, causing it to involuntarily move, which physiologically occurs to help produce the vibrato sounds, especially with the vibratos that Ayu uses, which are heavy, it'd very much create [dramatic] mouth movements.
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