This episode examines form in popular music and especially Progressive Rock by first investigating the distinction between extensional and intensional form (as presented by Andrew Chester) and glossing that as the distinction between "trekking" and "dwelling." The second segment targets some specific issues in Immanuel Kant's understanding of aesthetic form. The third segment turns to the adaptation of classical music by Emerson, Lake, and Palmer, and what that reveals about Prog Rock's approach to form. 

The picture of Keith Emerson is by Jean-Luc. Jean-Luc, CC BY-SA 2.0 , via Wikimedia Commons See the original here: https://upload.wikimedia.org/wikipedia/commons/e/ea/Emerson_Lake_and_Palmer_two.jpg