Music of the city

This is a long-delayed post. I commute into the Chicago Loop from Evanston on a regular basis. My normal inbound route includes Wells south of the Chicago River. Most of the time the sound is typical city stuff: cars zipping by, horns honking, or the often deafening sound of a CTA train rolling overhead. Once though, a slow-moving CTA train tapped out the beat to Glenn Miller's In the Mood. I thought it was cool.