How does the melody of a song (pitch, rhythm, intervals, tonal quality) help to enhance the lyrics of a song? MELODY http://en.wikipedia.org/wiki/Melody
Melody can be crucial to the lyrics of a song for a number of reasons. Rising pitch literally provide a more "upbeat" feel, while notes heading downward tend to quiet and calm us. When the lyrics match the interval direction, we have a consistency that pleases our minds and our ears. If we think of lyrics as telling a story, which so many do, a good melody is like the rising and falling action in a story.