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The 1812 Overture
Wagner, Flight of the Valkyries
I just heard this question on the Radio
It might be played over my Home Theater Sound System, but never again will it be on a "stereo" in this house.
A fully 2-D sound (there is not really any such thing as 3-D sound) can be achieved with two speakers. In a movie theatre where listeners are positioned over a wide area, there may be a case for more than two speakers, but at home, I don't think so.
2) You only have two ears - there is simply no getting around that. In order to appreciate the "depth" offered by three or more speakers, you need to turn your head. In a shoot-em-up game this might be a reasonable thing to do but, be honest, do you really want to be turning your head continuously while listening to music or watching a film?
Your ears consist of two tiny microphones called ear drums