This document discusses musical form and compares it to the structure of Oreos. It introduces the concept of musical form as the structure of how music is made and compares this to the parts of an Oreo cookie, which are the two outer cookies and the cream filling in the middle. The document suggests that a common musical form called ternary form, which has an A B A structure, is similar to how an Oreo is structured with two outer cookies surrounding a cream filling.