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In music, dissonance is the quality of sounds which seem "unstable", and have an aural "need" to " resolve" to a "stable" consonance. Both consonance and dissonance are words applied to harmony, chords, and intervals and by extension to melody, tonality, and even rhythm and meter. Although there are important physical and neurological facts important to the understanding the idea of dissonance, the precise definition of dissonance is culturally conditioned—definitions of and conventions of usage related to dissonance vary greatly among different musical styles, traditions, and cultures. Nevertheless, the basic ideas of dissonance, consonance, and resolution exist in some form in all musical traditions that have a concept of melody, harmony, or tonality.
Additional confusion about the idea of dissonance is created by the fact that musicians and writers sometimes use the word dissonance and related terms in a precise and carefully defined way, more often in an informal way, and very often in a metaphorical sense ("rhythmic dissonance"). For many musicians and composers, the essential ideas of dissonance and resolution are vitally important ones that deeply inform their musical thinking on a number of levels.
Despite the fact that words like "unpleasant" and "grating" are often used to explain the sound of dissonance, in fact all music with a harmonic or tonal basis--even music which is perceived as generally harmonious--incorporates some degree of dissonance. The buildup and release of tension (dissonance and resolution), which can occur on every level from the subtle to the crass, is to a great degree responsible for what many listeners perceive as beauty, emotion, and expressiveness in music.
Understanding a particular musical style's treatment of dissonance--what is considered dissonant and what rules or procedures govern how dissonant intervals, chords, or notes are treated--is key in understanding that particular style. For instance, in the common practice period, harmony is generally governed by chords, which are collections of notes generally considered to be consonant (though even within this harmonic system there is a hierarchy of chords, with some considered relatively more consonant and some relatively more dissonant). Any note that does not fall within the prevailing harmony is considered dissonant. Particular attention is paid to how dissonances are approached (approach by step is less jarring, approach by leap more jarring), even more to how they are resolved (almost always by step), to how they are placed within the meter and rhythm (dissonances on stronger beats are considered more forceful and those on weaker beats less vital), and to how they lie within the phrase (dissonances tend to resolve at phrase's end). In short, dissonance is not used willy-nilly but is used in a very careful, controlled, and well circumscribed way. The subtle interplay of different levels of dissonance and resolution is vital to understanding the tonal and harmonic language of this period.
Dissonance has been understood and heard differently in different musical traditions, cultures, styles, and time periods.
In early Renaissance music intervals such as the perfect fourth and thirds were considered strong dissonances that must be immediately resolved. The regola delle terze e seste ("rule of sixths and thirds") required that imperfect consonances should resolve to a perfect one by a half step progression in one voice and a whole step progression in another (Dahlhaus 1990, p.179). Anonymous 13 allowed two or three, the Optima intorductio three or four, and Anonymous 11 ( 15th century14th century 15th century 16th century other centuries) As a means of recording the passage of time, the 15th century was that century which lasted from 1401 to 1500. Events Renaissance affects philosophy, science and art. The New Monarchs come to power i) four or five successive imperfect consonances. By the end of the 15th century imperfect consonances where no longer "tension sonorities" but, as evidence by the allowance of their successions argued for by Adam von Fulda , but independent sonorities, according to Gerbert (vol.3, p.353), "Although older scholars once would forbid all sequences of more than three or four imperfect consonances, we who are more modern allow them." (ibid, p.92)
In the common practice period all dissonances were required to be prepared and then resolvedThe word resolution has several meanings, depending on context. Resolution (law), an action taken by a deliberative body, usually a legislature Angular resolution, the capability of an optical sensor to discern small objects Sensor resolution, the precisi, occurring on weak beats and quickly giving way or returning to a consonance. There was also a distinction between melodic and harmonicIn acoustics and telecommunication, the harmonic of a wave is a component frequency of the signal that is an integral multiple of the fundamental frequency. For a sine wave, it is an integral multiple of the frequency of the wave. For example, if the freq dissonance. Dissonant melodic intervals then included the tritoneThe tritone which derives its name from the fact that it spans three whole tones, is a musical interval of six semitones. Two tritones add up to an octave. An augmented fourth or diminished or flatted fifth is a tritone. It is abbreviated as pi . One of t and all augmentedIn music and music theory augmentation is the lengthening or widening of rhythms, melodies, intervals, chords. The opposite is diminution (diminished). A melody or series of notes is augmented if the lengths of the notes are prolonged. A melody originally and diminishedDiminution from Italian diminuimento is a musical term used to mean different things in the context of melodies and intervals or chords. A melody or series of notes is diminished if the lengths of the notes are shortened (this is opposed to augmentation w intervals. Dissonant harmonic intervals included:
Thus, Western musical history can be seen as starting with a quite limited definition of consonance and progressing towards an ever wider definition of consonance. Early in history, only intervals low in the overtone series were considered consonant. As time progressed, intervals ever higher on the overtone series were considered consonant. The final result of this was the so-called " emancipation of the dissonance" (the words of Arnold Schoenberg) by some 20th-century composers. Early 20th-century American composer Henry Cowell viewed tone clusters as the use of higher and higher overtones.
Despite the fact that this idea of the historical progression towards the acceptance of ever greater levels of dissonance is somewhat oversimplified and glosses over a great number important developments in the history of western music, the general idea was attractive to many 20th-century modernist composers and is considered a formative meta-narrative of musical modernism.
One example of modernist dissonance:
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