I resisted listening to music while a ran for a LONG time. Short or long, I liked to hear the rhythm of my breathing and heart rate. And don't misunderstand, I still do.
But today I noticed that my pace and stride actually changed with the music. I'm still experiementing with the "perfect" pace song, but it's fun to let my feet follow the rhythm in my head.
ORN: 5K, 37 minutes, R5/W1