Can listening to the Black Eyed Peas be deadly? Researchers at London University used the performance-monitoring MotorMate app to analyze video of folks behind the wheel and concluded that high-energy, uptempo tunes (e.g.: hip hop, metal) caused speeding and erratic driving. Apparently, the optimum tempo of a song for safe driving should mimic the human heartbeat — 60 to 80 beats per minute. Here are the best and worst songs to drive to, according to the study.