This document discusses the basic components and structures of songs. It explains that the verse conveys the message of the song through a changing lyric set to a familiar melody, while the chorus focuses the essence and meaning into a simple, memorable statement set to the same melody each time. Common song forms are then presented, including AABA, which consists of four 8-bar sections with the first and third being the same, and ABABCB or AABABA, which feature a repeating chorus section. Verse-chorus forms are most commercially viable as they provide familiarity through a catchy, repeating chorus.