One of the pioneers of rock'n'roll, Jerry Lee Lewis also happened to be a country music singer who liked to call himself "The Killer." He made a name for himself not just as a magnetic piano-playing singer, but also as an impulsive, gun-wielding wild man, who stoked epic rivalries with the likes of Chuck Berry and Elvis Presley. The Killer also notoriously married his 13-year-old second cousin, setting off an epic worldwide scandal.