In the late 80s-early 90s, 3D sound with stereo speakers was all the rage : Q-Sound, Roland RSS... there were several competing processing systems. Sting's "Th

In the late 80s-early 90s, 3D sound with stereo speakers was all the rage : Q-Sound, Roland RSS... there were several competing processing systems. Sting's "The Soul Cages" did use Q-Sound quite heavily, for anyone interested (edit: correct Sting album reference).