Vocal Coach Reacts to BTS singing "Butter" at Billboard Music Awards

Vocal Coach Andreas Grussl reacts to and analyses BTS singing “Butter” at Billboard Music Awards.
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video credit:
BTS, “Butter” Warner Chappell; BANGTANTV’s UA-cam Channel, UA-cam, May 24, 2021, • BTS (방탄소년단) 'Butter' @... , fair use
photo credit:
Photo of BTS, by BulletProof7BTS - 130914 인천 음악중심 - 방탄소년단, CC BY 4.0, commons.wikimedia.org/w/index... , masked and distributed under the same license as the original
photo of the Backstreet Boys, by Toglenn - Eigenes Werk, CC BY-SA 4.0, commons.wikimedia.org/w/index... , masked and distributed under the same license as the original