When using Imakuni?'s Doduo's "Harmonize" attack, if I'm still singing when it comes back to my turn, can I use "Harmonize" again?

The attack says "from the moment you use this attack you must begin to sing a song". So if you use Harmonize again you have to start a song over from the beginning (you may sing the same song if you wish) and the prior attack's damage gets placed immediately. It does not stack, sorry.

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