The 8-track tape (formally Stereo 8; commonly called eight-track cartridge, eight-track tape, and eight-track) is a magnetic-tape sound recording technology that was popular from the mid-1960s to the early 1980s, when the Compact Cassette tape, which predated 8-track, surpassed it in popularity for pre-recorded music. The format is obsolete and was relatively unknown outside the United States, the United Kingdom, Canada, New Zealand, Australia, Mexico, Spain, France, Germany, Italy, Sweden and Japan. The main advantage of the 8-track tape cartridge is that it does not have to be "flipped over" to play the alternative set of tracks.