This document discusses melody and how to write one. It defines melody as a series of single tones that form a recognizable whole. It notes that melodies are easy to recognize on their own or when combined with other elements. It then explains that modes were used as templates for writing chants and discusses the different church modes (Ionian, Dorian, etc.), providing examples of songs that use each mode. The document encourages practicing composing melodies using the modes as templates.