"So What" is the first track on the 1959 album #KindOfBlue by American trumpeter #MilesDavis. It is one of the best-known examples of #modalJazz, set in the #DorianMode and consisting of 16 bars of D Dorian, followed by eight bars of E♭ Dorian and another eight of D Dorian. This #AABA structure puts it in the #thirtytwobarFormat of American popular song. The piano-and-bass introduction for the piece was written by #GilEvans for #BillEvans (no relation).
https://www.youtube.com/watch?v=zqNTltOGh5c