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  2. 5.1 surround sound - Wikipedia

    en.wikipedia.org/wiki/5.1_surround_sound

    A prototype for five-channel surround sound, then dubbed "quintaphonic sound", was used in the 1975 film Tommy. [6]5.1 dates back to 1976, [7] when Dolby Labs modified the track usage of the six analogue magnetic soundtracks on Todd-AO 70 mm film prints.