SPEEDBALL BABY come at you all tumble-grind and twang-beat like thunder in a blizzard. Fusing the primordial slurp of rockabilly with a broken-homegrown hybrid of gospel testimony and punk mayhem, the group cuts a swath through the rotting cane fields of the contemporary music scene. Live, they harness hysteria - pounding out a thrown drink conniption fit as exuberant as a St. Vitas dance. Their shows have earned them the loyalty of music lovers and emergency room ghouls on both coasts and between.