What, So?, one of the most iconic jazz recordings of all time is Miles Davis So What. What, So? borrows the same chord progression but features a melody that is more approachable for young players. The key of concert Eb minor is used on the bridge. The melody here is presented in unison, making it easier to rehearse and help everyone learn together. There are many uses of forte-piano-crescendo figures in this chart. The solo section, while largely in concert D minor, inserts a measure of Ami7 every four bars along with a slight variation in the bass line and comping. A perfect chart to introduce young students to this wonderful music. (2:49)