I say this reminds me of a bowl cut because of the straight lines...across the forehead (fringe) and across the ears. The back is layered from the length along his neckline up to where the straight line is at his ears...or so it appears. This layering gives him all that great movement he has when he is moving about the stage. I would imagine it is razor cut layering as that is the trend these days. This gives it that great shaping around the occipital bone on the skull.
This is a horrible picture from the "Paint" program I did real quick to help give an idea. Where it is not filled in in pretty much all-one-length hair (no layering) And the back bottom is layered. Hope this helps

Sorry so primitive.
I do better drawings by hand.
