that is fine when you run alone but in a race it is often crowded and you need to be alert to other runners and obstacles around. I have witnessed another runner being tripped by someone running with music in a race because they were not aware they were there, that was why I asked the question.
The music wearer did admit to not realising the other runner was there and it sadly ended that runners race
one question to the music fans while running.....how do you hear the other runners around you even when on the trails? are you aware where other runners are who are behind you, going to overtake coming into a narrow part of the trail/road?
I am a non music person myself and find that I have a fab time running and have met some ace people on races where we have helped each other through tough parts not sure this would happen if I was to wear music.