Four of 1977's hit LPs, which are also available on stereo 8-track cartridge and cassette. Prerecorded open reel tapes are a thing of the past, as is the 4-track Stereo-Pak CARtridge. 4-channel (or Quadraphonic) LPs and 8-tracks, first marketed in the early '70s, are currently being phased out, as well.
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