Take a song like Billy idols Mony Mony.....toward the end at 2:54 there is a break at 2:54 that sounds like a jet airplane passing by left to right......now without a STEREO setup you would totally lose the effect for sure,....just sayin that's one example..losing the "chorus efx" on electric pianos is another like in the "Just the Way You Are" intro, etc, etc, ..