But why would you speed up “Bongos” by 12 percent? And what exactly does “sped-up nightcore” mean? Answering those questions takes us inside a trend that is dominating social media and gives us ...

Thomas S. Nilsen and Steffen Ojala Soderholm made songs with superfast tempos and high-pitched vocals for a school project. They were shocked to learn their “nightcore” sound had gone global. By ...