Explore the intricacies of sonata-allegro form and theme and variations in this 53-minute lecture from Yale University's "Listening to Music" course. Delve into the four types of music within a sonata: thematic, transitional, developmental, and cadential. Examine theme and variations through examples from Beethoven and Mozart's compositions. Witness a live performance of Corelli's La Folia, demonstrating a set of theme and variations. The lecture covers an introduction to the topic, parts of the sonata-allegro form, distinguishing functional types within the sonata-allegro, theme and variations, and an in-depth examination of theme and variations in Corelli's La Folia.