Théorie musicale II - Intermédiaire

THEORIE MUSICALE

1- QUINT CYCLE

BEFORE YOU BEGIN, WHAT IS A QUINTE?

The fifth is an interval of notes. It is therefore the difference that there is between 2 notes and it is usually given in tones or semitones

The fifth is the 4th note after the starting note (called the root). Do d mi fa ground.

The straight can have 3 natures:

Right (3.5 tones or 7 semitones away from the root)
Decreased (3 tones or 6 semitones apart from the fundamental)
Augmented (4 tones or 8 semitones apart from the fundamental)

WHAT IS THE QUINT CYCLE?

In music theory, thecycle of fifths(or circle of fourths) shows the relationship between the twelve degrees of the chromatic scale, their corresponding alterations and the associated major or minor key.

The cycle of fifths is the sequence of JUST fifths, we fall back on the starting note after a while.
As a reminder, the perfect fifth is 7 semitones higher than the fundamental (or 5 semitones lower if you want to see it going down).

So if we start from Do:

So if you notice correctly, you will see that the first fundamental is also the last fifth so we have a circle that closes. This is why we are going to talk about the cycle.

It is also interesting to note that if you read the chart from bottom to top you read the order of the right fourths and those more accustomed to the theory of you will know that the perfect fifth and the right fourth are complementary intervals (otherwise says if we are going to look for a note with an interval going up, we will find this same note going down with its complementary interval).
Which leads us to see that according to the direction of reading we have the cycle of fifths and in the other direction the cycle of fourths.

If we stay in the theory and we start from the F by reading downwards, we have the order of sharps in the major scale (and in the key signature of the scores):

Fa, Do, Sol, Ré, La, Mi and Si

And if we start from B and go back up, we have the order of flats in the major scale (and in the key signature of the scores):

Si, Mi, La, Ré, Sol, Do, Fa

Most of the time, we see a representation of the cycle of fifths in the form of a circle (which is quite logical actually):

A quoi servent les cycles de quintes ?

trouver la tonalité d’un morceau
transposer un morceau d’une tonalité à une autre
composer correctement vos morceaux
trouver les notes à jouer dans une tonalité
comprendre les tonalités, les accords, les gammes, les modes

Notes : Clockwise (clockwise) we can read the order of fifths and counterclockwise (counterclockwise) we can read the order of fourths.

It's important to find the fifth of a note quickly. You can also help yourself with your guitar, using the neck of the guitar to visually see the positions of the intervals.

I invite you to test everything we have just seen on your instrument, this is how this knowledge will take on more meaning and enrich your playing and your understanding of music.

C = tonal or tonic center, 5 = fifth

T = Tonic, 4 = quarta

Correct 5th (fifth) cycle: order of tones

Cycle de 5tes avec les tonalités majeurs et mineurs

2- The intervals

3- The ranges

4- Major chords

5- Minor chords

6- Seventh chords

The chord sequences

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This symbol is a natural. It cancels out the effect of the sharp or the flat, thus again producing a natural, original note.

Sharps and flats modify a note for the entire duration of the measure in which they occur, unless a natural force causes that note to become natural again.

All the diésées notes have their equivalent in flats, and vice versa. For example, A * and B "are played on the same fret. Two notes which have a different name but which are of the same pitch are said to be" enharmonic equivalents ".