You use the rear channels to get a feeling of being in the space its played in, if you see Classical or even rock the music doesnt stop at your ear, it is all around you, and a good multi-channel mix can do a good job of filling your room with that feeling of being there....to a degree.
Rush in 5.1 surround
I was just wondering how Rush fans were reacting to the new album being released in 5.1 Hi rez? I know there was alot of controversy over the final production of Vapour Trails and complaints it was recorded to loud and distorted. I kinda liked it! and I can hardly wait for Snakes and Arrows.