Falsetto
False, airy voice that makes the upper register (high notes) easier to access with this voice. To be more specific, it is a weaker, breathier extension of the head voice. An example of falsetto in K-Pop is Rain’s “30Sexy“.
Head voice and falsetto differ in tone and production. Head voice is produced by thyroarytenoid muscles fully vibrating and coming in contact with each other, whilst falsetto is produced by only thin edges of the thyroarytenoid muscles vibrating and coming in contact with each other, which offers less resistance of the breath flow. In other words, in falsetto production, there is air passing through the vocal cords, as opposed to head voice production where no air is passing through it. This causes the tone to be airy and weak with lack of resonance. Falsetto is therefore a disconnected part of the voice, while head voice is a connected part of the voice (the whistle tone is however a disconnected part of the voice) We can also refer to falsetto as a “disconnected head voice”. If the falsetto is unnaturally airier than usual, meaning that an extremely small portion of the vocal cords come in contact, then we can call this falsetto a “disconnected falsetto”. When a head voice is resonant, we call it a “developed head voice” and well developed head voice usually sounds operatic, for example Ock Joo Hyun at 3:53~3:57:
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