Is Hayley Westenra a proper singer?

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Dame Kiri Te Kanawa allegedly declined to share the stage with Westenra at the Sky City Starlight Symphony concert in the Auckland Domain. She has been quoted as calling Westenra a "fake singer".
Westenra's father didn't want to be drawn into the spat, but said the two singers' styles were "like apples and oranges" and it was wrong to compare them.
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