Making Music Made Easy As Soup

Music Harmony

This is the colour of the "musical soup". If you were making Minestrone, this would be the flavours (garlic, celery). If you were writing a persuasive essay, this would be the tone. If you were painting, this would be the colours.
The Harmony of a song is what sets the mood and gives context to the melody. Not all songs have harmony, just like not all soups have added flavours, just like not all persuasive essays have a tone, just like not all paintings have colour.

Well, at least not intentionally. Nevertheless, Harmony is a modifier and it makes melody better (or worse) and is meaningless on its own. Also, a fact of little importance, even if you don't explicitly provide a harmony, in most cases, the melody of a piece will provide some sense of harmony on its own.

Next: Learn about Rhythm in Music.