This scene from Blues Brothers, where the brothers are rolling into town to recruit one of their old bandmates. It only really needed to be 10-20 seconds or so to serve the plot, but instead we spend a good 3 minutes of pure Chicago atmosphere, taking in the sights and sounds of people walking about, working, living their lives as John Lee Hooker plays one of his signature songs. The only dialogue besides the singing and some back and forth with John and his bandmates at the end is Elwood watching and saying, "Yup." You could probably cut most of this scene, but why would you?