I'm curios to hear what you folks have to say. This would be something I'd only use while on a MUP, never on a street.
I've never relied on my hearing much when I ride. I always check over my shoulder whenever I do anything unexpected such as passing somebody. I also always stay as far right as I can whenever I'm on a path, no matter how deserted it is. Either way, I think the best option would be to mount some earbuds onto my helmet, so I can hear them but they're not in my ear. Partially for safety and partially for comfort.
But I'm still not really sure if I want to do this. 1. MP3 players are 'spensive and 2. those oblivious dumbasses who walk/run/skate/ride in the middle of the path with headphones a'blaring piss me the eff off.
Anyway, just thought I'd get some opinions before I do anything stupid.