New music?

For the past months I have had more or less the same music on my mp3 player. I add a few new ones, but changes aren't made often. But what amazes me is that almost every run I find a new song. This obviously means that I go off into some far off land while running and block out everything. It kind of makes me wonder why I have the music there in the first place yet I would be lost without it. So as I did my 8 miles I enjoyed both the old and the "new" songs to keep me going. Wonder what surprises are tucked in there for the actual race??