Anyone recall an experiment about 20 years ago -
Some music was played on Radio 1 in stereo, but it was explained on Tomorrow's World at the same time.
CD technology allowed for recordings to 'fool' the ears/brain by playing certain instruments/frequencies at a slight delay (millisecs)
This fooled your ears into thinking the music came from different places - and I could have sworn there was someone playing drums behind my sofa.
It promised a lot, "surround sound" could be played on standard equipment, but I've never heard of it since.