Agreement of four notes

• the harmonic minor range contains seven species of agreement of seventh:

• Examples, in major C and C minor :

Study plan

VIIe degree of both modes being like we let us know a bad degree - the sensitive not being able to be Fondamentale of a agreement, put aside in the particular case of the steps -, the agreement of four notes formed about this one must be regarded as an agreement of Dominante without fundamental. Its study will be consequently approached in the article devoted to with the agreements of five notes.

In an agreement of seventh - or ninth - of dominant, the seventh and the third - i.e., the sensitive one - are two gravitational notes separated by a decreased fifth. This harmonic interval, stone angular of the tonal harmony, determines these two notes, in such way that their only presence in an agreement is enough to make identify this one like a agreement of dominant . Consequently, in such an agreement, the fundamental one - i.e., the dominant itself - is less essential than these two characteristic degrees. For this reason one frequently removes the fundamental one of an agreement of seventh - or ninth - of dominant. It is for this reason also, that an agreement placed on VIIe degree is inevitably felt like an agreement of dominant private of its fundamental.

• the study of the agreement of seventh of dominant will have to thus be divided into two, according to whether the dominant one is present or not in its agreement, because the seventh of dominant with fundamental and the seventh of dominant without fundamental, though playing the same harmonic and tonal part, have neither same the figuring, nor the same mode of realization and sequence.

• the various species of agreement of seventh - others that 1st, that placed on the dominant one of the two modes - are traditionally gathered under name: agreements of seventh of species.

General information on the use of the agreements of four notes

An agreement of four notes, whatever its species, fact its ordinary sequence on the agreement whose fundamental one is located at the lower fifth. All the other sequences are exceptional sequences.

Any agreement of four notes, contains two harmonic fifths: one located between the fundamental one and the fifth - following the example Agreement of three notes -, the other, between the third and the seventh. It will be advisable not to forget this characteristic at the time to check if there is no consecutive fifths.

Preparation

The seventh of an agreement of four notes must be in theory prepared by movement obliques, therefore, while making hear one of its two poles in the preceding agreement.

Resolution

The regular resolution of the seventh is carried out by contrary movement and joint: this one goes down jointly while the fundamental one progresses by contrary movement. If the seventh, either remains in place - by unison right or Enharmonie -, or goes up, of a Demi-ton or a your, one has then business with a irregular resolution.

It is appropriate to note that when the sensitive is the seventh of an agreement - agreement of Ier degree, therefore -, this one must make its regular resolution on the lower degree, and not on the higher degree, in other words, the function of seventh - and obligation of resolution which results from this - at the priority on the function of sensitive. Moreover, VIIe degree must truly be regarded as sensitive that when it is third of an agreement of dominant .

In theory, the interval of seventh should not be transformed into octave just by oblique movement. This transformation into octave right is allowed only if the seventh belongs to a agreement of passage whose fundamental one can be analyzed like a Passing note or a embroidery, therefore, preceded and followed by a joint movement.

Lining

The lining of seventh is allowed if this seventh belongs to an agreement of passage whose fundamental one can be analyzed like a passing note or an embroidery, therefore, preceded and followed by a joint movement.

Remarks

• When an agreement of seventh has a perfect fourth on its low - it is the case of the 2 {{E}} and 3 {{E}} inversions -, if this one is not strictly prepared by oblique movement, it must be introduced by contrary movement and unites at least in a left. In the event of ordinary sequence, the natural resolution of the quad is done in the following way: the quad remains in place, the low one goes up or better, goes down, jointly. Such agreements can be indifferently employed on key periods or weak.

• the double syncope is possible if the key period is occupied by the second inversion of an agreement of four notes.

• When the third of an agreement of three notes is placed below the seventh, this third should not go down jointly, under penalty of causing consecutive fifths because of the movement obliged of the seventh.

See too

Internal bonds

• Agreement (music)
• Agreement moving
• Agreement of loan
• Agreement of three notes
• Agreement of five notes
• Rates
• Ranges and temperaments
• tonal Harmony
• harmonic Walk
• Modulations
• melody Movement
• harmonic Movement
• foreign Note
• Musical theory
• Musical theory and intonation
• tonal System