The concert was definitely pre-recorded but I don't necessarily think they did anything crazy to her vocals. You can hear she's singing in a different way and is exercising more control rather than just shouting the loud bits and screeching the high notes. She also fixes her ear piece a lot more often I've noticed in the last few lives. Maybe they've gotten a new one that can help her hear herself more through her hearing issues. That would definitely help her pitching.
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