A Twitter friend tweeted about this earlier in the day. It's an interesting notion.
According to researcher Andy Gibson, the American voice is easier to sing with and is so commonplace that it should be called the "pop music accent" instead.
Mr Gibson, of the Auckland University of Technology, made the claim after tests on New Zealand singers.
He found that despite speaking with distinct Kiwi accents, they would automatically sing the same words just like true Americans.
This is because singing in a local accent would sound funny and because American rounding off of words makes it easier to sing them.