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This article is about musical harmony and harmonies. For other uses of the term, see Harmony (disambiguation).

Harmony is the use and study of pitch simultaneity and chords, actual or implied, in music. It is sometimes referred to as the "vertical" aspect of music, with melody being the "horizontal" aspect. Very often, harmony is a result of counterpoint or polyphony, several melodic lines or motifs being played at once, though harmony may control the counterpoint.

Origin of term

The word harmony comes from the Greek ἁρμονία harmonía meaning "a fastening or join". The concept of harmony dates as far back as Pythagoras.

Historical rules of harmony

Some traditions of music performance, composition, and theory have specific rules of harmony. These rules are often held to be based on a natural properties such as Pythagorean tuning's low whole number ratios ("harmoniousness" being inherent in the ratios either perceptually or in themselves) or harmonics and resonances ("harmoniousness" being inherent in the quality of sound), with the allowable pitches and harmonies gaining their beauty or simplicity from their closeness to those properties. Other traditions, such as the ban on parallel fifths, were simply matters of taste.

Although most harmony comes about as a result of two or more notes being sounded simultaneously, it is possible to create harmony with only one melodic line. There are many pieces from the baroque period for solo string instruments for example, in which chords are very rare, but which nonetheless convey a full sense of harmony.

For much of the common practice period of European classical music, there was a general trend for harmony to become more dissonant; chords considered daring in one generation becoming commonplace in the next.

Types of harmony

Carl Dahlhaus (1990) distinguishes between coordinate and subordinate harmony. Subordinate harmony is the hierarchical tonality or tonal harmony well known today, while coordinate harmony is the older Medieval and Renaissance tonalité ancienne, "the term is meant to signify that sonorities are linked one after the other without giving rise to the impression of a goal-directed development. A first chord forms a "progression" with a second chord, and a second with a third. But the earlier chord progression is independent of the later one and vice versa." Coordinate harmony follows direct (adjacent) relationships rather than indirect as in subordinate. Interval cycles create symmetrical harmonies, such as frequently in the music of Alban Berg, George Perle, Arnold Schoenberg, Béla Bartók, and Edgard Varèse's Density 21.5.

Harmony may also be distinguished as centrifugal or centripetal harmony, harmony which leads away from or to the tonic, respectively. For example, music of the classical era is more often centrifugal, while the ragtime progression is centripetal. (van der Merwe 1989)

References

Dahlhaus, Carl. Gjerdingen, Robert O. trans. (1990). Studies in the Origin of Harmonic Tonality, p.141. Princeton University Press. ISBN 0691091358.
van der Merwe, Peter (1989). Origins of the Popular Style: The Antecedents of Twentieth-Century Popular Music. Oxford: Clarendon Press. ISBN 0193161214.

External links

Harmonic Progressions with demos and how to harmonise a melody
General Principles of Harmony by Alan Belkin
Tonalsoft Encyclopaedia of Tuning
On-line essay: Evidence of Harmony in Ancient Music, -- publ by Archaeo. Musicalis 1988). Study of oldest known song
Role of the drone in the evolution of counterpoint & harmony

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 Although most harmony comes about as a result of two or more notes being sounded simultaneously, it is possible to create harmony with only one melodic line. There are many pieces from the [[baroque music|baroque]] period for solo [[string instrument]]s for example, in which chords are very rare, but which nonetheless convey a full sense of harmony.
-For much of the [[common practice period]] of [[European classical music]], there was a general trend for harmony to become more dissonant; chords considered daring in one generation become commonplace in the next.
+For much of the [[common practice period]] of [[European classical music]], there was a general trend for harmony to become more dissonant; chords considered daring in one generation becoming commonplace in the next.
 == Types of harmony ==