Oh, man, that's exactly what I talked about on one of my podcasts, Marathon Man, on East London Radio back in the autumn! :-) I can't stand the snobbery of the listen-to-the-sounds-of-nature brigade. As a marathon-runner, I've done both no-device running and music-on-the-go training. I tend to go for the latter. Today was a good example. My first time doing 11 miles in a couple of months. It was lovely. And I was helped a great deal by my soundtrack. From soul to rock, from Latin to classic, I cram a lot in my little, battered mp3 player. :-)