The research looks at the effects of music tempo on running pace and heart rate. The purpose of the study was to determine if a list of slow tempo music would have a different effect on heart rate and running pace, lower heart rate and slower pace, then a fast tempo list of music, raise heart rate and faster running pace. There were six participants averaging 26 years of age with 2-17 years running experience. The participants were told to listen to the music and not worry about laps or time, just treat the run as a normal training run. The run was 1.5 miles around the Jewish Community Center track in St. Paul. There were seven heart rates taken, one at rest, five through out the run, and one at the end of the run. Minitab was used to analyze the heart rates and running pace. There was no significant difference for heart rate or running pace when comparing the slow and fast tempo results. Running with music may provide a distraction for the runner making running more enjoyable but there appear to be no performance benefits or differences in heart rate.