Listening to a good 5.1 mix is an experience that can only be heard not described. A 5.1 mix simply means 5 speakers plus a sub woofer (.1) Many home theaters are set up in 5.1 already however if you are one of the lucky ones yet to experience the surround Tull mixes and would like to get into it. There are many great resources on the net for  helping getting you set up including the link below.