Can harmony be taught?
If you can sing a melody in tune, you can teach your ears how to sing harmony lines as well. Like most things in music, harmony singing is a skill that can be practiced and mastered. Before you can learn how to sing harmony, you need to be able to sing in tune.
How do you explain harmony to a child?
Harmony means playing several notes together to make “chords”. The word comes from the Greek harmonia meaning "to join things up" . A tune by itself can sound nice, but it can be “harmonized” by adding an accompaniment of chords. Studying how to do this is called harmonization.