For those who care, the chance to watch the K-pop band BTS preparing for the Billboard Music Awards is compulsory. An ad hoc video (now taken down) which showed the band horsing around with a number of performers, including Drake, was posted early Thursday. At 2 p.m. it had close to a million views, rendered no doubt by the band’s enormous international fan base. BTS was formed in 2013 and took its name from the Korean expression Bangtan Sonyeondan, which translates to Bulletproof Boy Scouts. In 2017, it announced, for English speakers, the acronym would be changing to stand for Beyond the Scene. Now you know.