8-track player

Stereo 8

Media type	Magnetic tape endless loop
Encoding	Stereo analog signal
Capacity	Four stereo channels
Read mechanism	Tape head
Write mechanism	Magnetic recording head
Developed by	Lear Industries
Usage	Audio storage
Extended from	Fidelipac / Mohawk cartridge

The 8-track tape (formally Stereo 8; commonly known as the eight-track cartridge, eight-track tape, or simply eight-track) is a magnetic tape sound-recording technology that was popular in the United States from the mid-1960s to the late 1970s, when the Compact Cassette format took over. The format is regarded as an obsolete technology, and was relatively unknown outside the United States, the United Kingdom, Canada, New Zealand, Australia, and Japan.

Stereo 8 was created in 1964 by a consortium led by Bill Lear of Lear Jet Corporation, along with Ampex, Ford Motor Company, General Motors, Motorola, and RCA Victor Records (RCA). It was a further development of the similar Stereo-Pak four-track cartridge introduced by Earl "Madman" Muntz, which was adapted by Muntz from the Fidelipac cartridge developed by George Eash. A later quadraphonic version of the format was announced by RCA in April 1970 and first known as Quad-8, then later changed to just Q8.

The original format for magnetic tape sound reproduction was the reel-to-reel tape recorder, first available in the United States in the late 1940s, but too expensive and bulky to be practical for amateur home use until well into the 1950s. Loading a reel of tape onto the machine and threading it through the various guides and rollers proved daunting to some casual users—certainly, it was more difficult than putting a vinyl record on a record player and flicking a switch. Because in early years each tape had to be dubbed from the master tape in real-time to maintain good sound quality, prerecorded tapes were more expensive to manufacture, and costlier to buy, than vinyl records which could be stamped much quicker than their own playing time.

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