Can the word もう be pronounced むう?


I heard the word もう (meaning "already, not anymore") pronounced as むう in this
song: <https://www.youtube.com/watch?v=3R3uMTMHgPc> at about 1:18, and yet it
is transcribed as "mou". Is it a pronunciation mistake or a dialectal
pronunciation? Did the person mistranscribe what is said, or did I simply
mishear the word? Thanks very much for your answers.




The word actually sounds closer to むう to my ears, and it should definitely be
pronounced as モー. I don't think dialects are relevant. In [this original
video](http://www.nicovideo.jp/watch/sm5992615), I can see at least one
comment pointing out that part sounds weird.

That said, I don't like to call it a pronunciation (or "input") mistake --
although this song is known as one of the most natural, [well-"trained"
Vocaloid songs by Luka Megurine](http://dic.nicovideo.jp/a/rip%3Drelease), her
voice is synthesized after all, and her pronunciation is far from perfect. I
don't recommend you learn something about pronunciation from Vocaloid songs.

