I dropped my truck off for new tires yesterday and since I was only a couple of blocks from work I decided to walk. As I was walking I started quietly singing the song that was in my head. After a while I started thinking that the folks in cars probably thought I was a crazie walking the street talking to myself. I stopped singing for about three seconds, then thought- “ screw it.” 
Tom Petty's American Girl is a good marching tune.