Most likely not Mariah's fault. Monitors down = vocal performance woulda been a disaster. She was right to stop! 
https://youtu.be/q9Q2i_9PHU0
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Replying to @miracleofsound
with experience in sound and stage tech, I can say it's virtually impossible to stay in tune using the mains mix.
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Replying to @OpenTsu @miracleofsound
what the audience should hear and what the performer needs to hear can be completely different.
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Replying to @OpenTsu
I did live gigs for years, I've seen it happen
6:17 AM - 1 Jan 2017
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