Harmony, in music, is the sound of two or more notes heard simultaneously.
Melody and rhythm can exist without harmony.
The greatest part of the world’s music is nonharmonic. Many musical styles consist basically of unharmonized melodic lines and their rhythmic organization. Harmony in the Western sense is a comparatively recent invention. Harmony
Chords are three or more single pitches that are heard simultaneously.
There are several different chord types, and each chord type has a particular sound. The basic chords are:
1. Major chords
2. Minor chords
3. Diminished chords
4. Augmented chords
5. Suspended chords
Recognizing how chords sound