ETYM French harmonie, Latin harmonia, Greek armonia joint, proportion, concord, from armos a fitting or joining. Related to Article.
1. A harmonious state; congruity of parts with one another and with the whole; SYN. concord, concordance.
2. Agreement of opinions; SYN. concord, condordance.
3. An agreeable sound property.
4. Compatibility in opinion and action; SYN. harmoniousness.
5. The structure of music with respect to the composition and progression of chords; SYN. musical harmony.
In music, any simultaneous combination of sounds, as opposed to melody, which is a succession of sounds. Although the term suggests a pleasant or agreeable sound, it is applied to any combination of notes, whether consonant or dissonant. The theory of harmony deals with the formation of chords and their interrelation and logical progression.
The founder of harmonic theory was Jean-Philippe Rameau. In his Traité de l’harmonie/Treatise on Harmony 1722, he established a system of chord classification on which subsequent methods of harmony have been based.

1. Borough in Pennsylvania (USA); zip code 16037.
2. City in Minnesota (USA); zip code 55939.
3. Town in Indiana (USA).
4. Town in North Carolina (USA); zip code 28634.