SEASON FINALE: Just as I’m picking up my cap and gown for college graduation ceremonies, so is Axl. The difference is, I’m a professor, so there’s no pressure, whereas Axl is so thrown by the thought of entering the “real world” for good that he assents to a heart-to-heart talk – with his mom (Patricia Heaton). And Sue, halfway through her own college experience, is a bit depressed by it all, but not for long, as her day, and the season for The Middle, ends with a sudden explosion of song.