Hello Runwiththewind,
Whilst I wouldn’t call myself superExperienced, I have done a couple of marathons, as well as other race distances. I used music in both marathons. I’ve started to train without music now, so I can concentrate more on pacing as I have some very specific goals, however, I do still take my music out on a long run, when I’m running in daylight. For the two marathons I’ve done, I actually created a playlist of songs that would pick me up at certain points. For example, I put an uplifting song around each hour. I also tended to put many songs that I find inspirational/motivational towards wher I think I’m in the last hour of the race and really need to dig deep. I don’t think the headphones took away from the atmosphere – really depends which marathon your doing?
London was my first, and the crowds were so loud that it didn’t matter that I was wearing the headphones.
I would say stick with the music if you’re used to it, but perhaps set up a playlist that will help you get through the race, so you’re not annoyed at the most difficult part of the race with an annoying song that’s on your ipod from a compilation for example!
Good Luck!