Earlier this spring, dozens of mysterious VHS tapes began showing up in mailboxes around the world. On one side of the tape was a hexagon, an image used by the beloved, but secretive, Scottish electronic band Boards of Canada. By the mid-2000s the group had cultivated an air of mystique, built on an enigmatic musical style that mixed analog nostalgia with an otherworldly ambience. The band was also relatively anonymous and rarely gave interviews.