You might be wired differently than me, but if I had to learn from an audio source- I would have to focus on that. Which would distract me from paying attention to my surroundings. I have an mp3 player for the bus part of my multimodal commute, but I put it away whenever I get on the bike. Of course, me being legally blind and having to rely on my hearing more than most people probably do may have something to do with it.