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 YouTube Channel, YouTube, May 24, 2021,    • BTS (방탄소년단) 'Butter' @ Billboard Musi...   , fair use

photo credit:

Photo of BTS, by BulletProof7BTS 130914 인천 음악중심 방탄소년단, CC BY 4.0, https://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 BYSA 4.0, https://commons.wikimedia.org/w/index... , masked and distributed under the same license as the original