How is harmony defined in music?

Harmony in music refers to the combination of different musical notes played or sung simultaneously to create a pleasing or interesting sound. It involves the alignment of pitches that complement each other, often forming chords, which help to establish a piece's emotional character and fullness. Harmony works in tandem with melody to enrich the musical experience, giving depth and context to the main tune.

In musical contexts, harmony can define the relationships between notes and how they interact. For example, when a singer harmonizes with another vocalist, they produce chordal sounds that enhance the melody. This simultaneous arrangement of notes can evoke various emotions, contributing significantly to the overall feel of a musical composition.