Actually a very important part of the stereo spectrum is to create room for every sound in an orchestra.... if you for example have 2 sounds in the same frequency band, you can move them in the stereo spectrum to allow people to differtiate and hear both instruments....

You need to ask yourself if this is a requirement in a live and crowded setting for your music to sound better... or if you want to make the whole musical performance come from one corner of the room, allowing the people more room to talk to eachother..