In a perfect world, each instrument would have it's own speaker and the recorded media would have a separate track for each instrument.The listener would place the speakers around the room and the result would be like sitting on the stage with the band. Zappa recorded some of his pieces like this. Unfortunately, we'll never hear them.

In the real world most everything is recorded, engineered, and mixed for left and right. If you want your music to sound "cool" spend you money on six speakers and six channels of amplification. If you what it to sound "real" spend your money on two.