Don't forget Quadrophonic
My Akai reel-to-reel was capable of Quadrophonic sound with the right media. The matching reciever and turn table all produced great 'surround sound' for its day! They would place mic's around through-out the orchestra or band & record different angles of sound from the various positions for play back from a 4 speaker system. This gave you the feeling that you were in the middle of the performance instead of sitting out front of it in the audiance. For its time it was something else, but it never truely caught on due to the expense of making the recordings.
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