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I don't hear it. I just watched the two videos in tandem and it is exactly the same note (try singing along with her if you can follow music and listen to yourself; did the note you sang change?). It hasn't been pitch corrected at all; it simply sounds infinitely better because the audio quality is infinitely better (also some of the refortifying echo from it was captured on the DVD quality video that was simply absent from the live stream). That goes for the whole song. The official DVD will depict more of the natural depth and character of her voice than the live stream ever did, and that's going to give you an entirely different perspective on her performance.

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There are still plenty of flat or strained notes (0:43, 1:03, 1:08, 1:51, I could go on, but you'll notice this aligns exactly with the original broadcast if you care to compare...) and her characteristic dipping, meandering singing style persists. I don't really see how you can call it a significant change if there isn't a significant difference. Everyone is entitled to their opinion, of course, but I'm kind of confused as to how people aren't hearing the imperfect notes in the official video considering that they are even more obvious than they were before given the audio quality. :/

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Almost certainly the first. I suppose it's possible they interchanged certain segments from one night to the other, but the DVD video parallels the live stream musically from start to finish, so I don't think that's the case.