Rebecca Davis editorK-pop group BTS has become a global brand. Thanks to the band’s dazzling dance moves, layered music videos, engaging social media posts, and references to everything from Erich Fromm and Nietzsche — not to mention vocal abilities on the level of the best in the current pop arena — members RM, Jin, SUGA, j-hope, Jimin, V and Jung Kook have made the music of their South Korean roots universal to those who love pop and appreciate the genre for its sonic optimism.