The Turn is present in many things: Jokes, Cards, etc. It is that point where something expected turns into to something different than expected and you laugh at a punchline, or win or lose at Texas Hold'em, etc. Life has The Turn too and apparently so does music ;) This is built around a 3 part progression that doesn't fully "mature" until... "The Turn" in that progression...lets call it a study of progression and progressive ideas...