Been humming this classic for the past few days, only to discover today that ANOTHER genius added his touch to this masterpiece. That genius was Stevie Wonder, on harmonica.
There’s too many things that make this composition a stand out on every level, but one of the first that comes to mind is the meandering chord progression. Quickly changing, and never standing stationary in one place for long. Fairly straight forward stuff, but what really makes it shine is the magic in the arrangement.