I am getting a bit tired of having to listen to another "jumbled" Birkat Kohanim this Yom Tov. It seems to be the same in almost every shul. There are always a group of Kohanim that sing a different tune than the others.
I understand that the Levi'im in the Bet Hamikdash had a choir master, so I assume that they must have rehearsed before they sang. Is there any supporting halacha or minhag that would require or recommend that Kohanim rehearse or at least agree to a uniform tune for duchenin before performing it?