Have you even heard the intro? Her vocals in it prove she could sing opera well. Not the best, but well.
Opera is more than singing in head voice It requires a certain pronunciation and annunciation that isn't seen in pop music. There's a whole technique to it, that's very nitpicky, but most pop singers can't do it. Not even the best pop vocalist.
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Her vocals in it prove she could sing opera well. Not the best, but well.
