This is the sound of cars passing over the Milwaukee River on the McKinley bridge near Edison St. There was a grate that the cars passed over to make the deep grumbling noise.
This is the sound of a spinning sign outside of the Marcus Center for the Performing Arts. It was advertising the upcoming plays and performances and was electrically powered.
This sound is of a man trying to start his truck in the bitter cold and it just won't go. I was near him for about fifteen minutes and I never heard it start. Click here to play sound.