EVERY singer needs voice lessons. And they will need it for their whole career. For some odd reason both Ayu and Hikki postponed those far into the first decade of their careers, and the results are clear on their lives.
Ayu also forced a high pitched nasal voice that wasn't natural to her. Any unnatural way you force your voice while singing damages your voice. This is very clear for Ayu, Christina Aguilera, Britney Spears and probably Hikki too.
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