The English rock band Radiohead once recorded a song called “How to Disappear Completely.” Earlier this week, the band appeared to have done just that. On Sunday, Radiohead slowly started to disappear from the Internet. Its Facebook posts and tweets were erased. The band’s website went white. Radiohead fans quickly began discussing the possibility of a new album. It would be the band’s ninth studio album. Then, on May 3, the band posted a 15-second video clip on its previously empty Instagram account. The video showed an animated bird made of clay. Later that day, it posted another video on Instagram of several animated clay people wearing masks, circling around a woman tied to a tree. And then, finally, came a music video for the band’s first new song in five years. The song is called “Burn the Witch.” Scenes from the short Instagram videos appear in the music video. It has already been viewed more than 7 million times on YouTube.