I went to see Coldplay last Sunday. It was the band’s first ever visit to South Korea, so competition for tickets was insane. The venue, a massive stadium that holds up to 100,000 people, had sold out in just five minutes. The audience contained some serious Coldplay fans. The woman sitting next to me, for example, was wearing a “Head Full of Dreams” T-shirt and holding a sign reading “CHRIS MARTIN.” Shortly before the concert started, she kindly told me how to prepare for it. “They’re going to play “Yellow” after the first song, and we’ll hum along together. You know the melody. Right?”