This final chapter, a complement to Chapter 5, considers music “after emotion,” shaped by theories of affect. Affect attends to the microscopic nuances of feeling not captured by the “garden variety” emotional categories. I consider varieties of affect through stages of European modernism (from Debussy, Stravinsky, and Schoenberg to Boulez, Stockhausen, and Lachenmann), the neo-realism of “American Cool” (including Copland, Reich, and Cage), and then within a range of contemporary popular music (including Radiohead, Eminem, Beyoncé, and music for gaming). Regarding theories of affect, the chapter contextualizes these musical styles within two diverging “lines of flight” emanating, respectively, from the vitalism of Bergson and Deleuze, and the phenomenology of Husserl, Heidegger, and Sartre. The chapter, and the book, concludes by asking why interest in musical emotion is so current.