1. The Grateful Dead
Could any other band have conceivably won this poll? Back when most rock groups played the same carefully rehearsed 25-minute show over and over for months on end, the Grateful Dead were playing two-hour sets that changed wildly from night to night. They often didn't even have a set list, choosing to simply walk onstage and see where the music took them. Jerry Garcia has been dead for nearly 20 years, but the surviving members have played together in various permutations ever since. It all ends this July at Chicago's Soldier Field, though the guys will surely be playing this music on their own until they drop.