The Eight Track Museum opens on Monday in the Deep Ellum arts district of Dallas. If you’re under 40 you may have never seen or heard an 8-track audio tape. The 5.25x4x.8 inch plastic tape cartridge was big and bulky, but it became wildly popular in cars in the 1960s. An 8-track cartridge contains a continuous loop of quarter-inch tape. The ends of the tape are linked by a metal foil splice, and the tape is divided along its length into 8 channels, or tracks (hence the name).