Circle of 5th and Key Signature


Circle of 5th and Key Signature


Circle of 5thandKey signature I would like to elaborate on the .

First, look at the figure below.

This is called ” Circle of 5th , and it is almost always included in theory books, but there are not many books that explain this figure in detail . First of all, I would like to explain in detail from here.

The name of this figure is “Circle of Fifth”.

This is a diagram that if you increase the interval from the ” C ” sound by ” P5th ” and proceed, it will return to the ” C ” sound again via all the keys .

( Key signature is referred to as Key from the following)

When P5th goes up from “c” ( do ) , it is “g” ( so ) .

When P5th goes up from “g” ( so ) , it is “d” ( re ) .

Next, if you go down the circle, the interval will go down on P4th .

As with up , even if you proceed with P4th , it will return to the “C” ( do ) sound via all the keys .

Next, inside the circle is a ” minor key

Major Key ” is written on the outside of the circle .

This stands for ” Relative Key ” .

Keep in mind that there are always major and minor keys in the ” Key .

Am ” on the inside of “Circle of 5th” and ” C ” on the outside are considered as Key = C when composing using a bright song ( major scale ) in this score . , If you are composing with the same score using a dark song ( minor scale ) , you are thinking with Key = Am .

Now, I would like to explain the “#” and “♭ of the Key signature “.

For ” Key signature “, the “#” symbol increases by one each time P5th Up .

(Goes to the top of the figure)

* When P5th Up from C , it is G. There is one “#” in the Key of this G , and it is attached to the position of f ( fa ) .

* Next, when P5th Up from G , it is D. There are two “#” in the Key of D , and the positions of f ( fa ) and c ( do ) are attached.

* Next, when P5th Up from D , it is A. There are three “#” in the Key of A , and they are attached to the positions of f ( fa ) , c ( do ) and g ( so ) .

As you may already know, the positions marked with ♯ will increase by P5th Up .

If you repeat this, it will return to the original C ( do ) .

Let’s take a look at the case of going down in the figure of ” Circle of 5th “.

Here, the interval progresses at P4th Up , and the ” Key signature ” increases by one “♭” symbol each time P4th Up .

* When P4th Up from C , it is F. There is one “♭” in the Key of this F , and it is attached to the position of b ( ti ) .

* If you P4th Up from F , it will be B ♭ . There are two “♭” in this B ♭ Key , which are in the positions of b ( ti ) and e ( mi ) .

* If you P4th Up from B ♭ , it will be E ♭ . There are three “♭” in the key of this E ♭ , and they are attached to the positions of b ( ti ) , e ( mi ) and a ( la ) . 1 ( b ♭ , e ♭, a ♭)

The position with the ♭ symbol also increases by P4th Up .

If you repeat this in the same way, it will return to the original C ( do ) .

The next thing to keep in mind is Enharmonic key.

This is read differently, but I hope you can understand that the actual sound is the same.

For example, when you are asked to play the “ti” sound on the piano and when you are asked to play the “♭do”, the actual sound will be the same. Regarding the sound, it is called an enharmonic, but when it is a key, it is called an enharmonic Key . Therefore, B and ♭C , #F and ♭G, and #C and ♭Dare enharmonic.

I explained a lot, but did you understand what the ” Circle of 5th ” stands for?

Also, regarding the interval, I think you can understand that only the 4th and 5th are not ” M( major ) or ” m( minor ) but ” P( perfect ) .

I wonder if it’s the mechanism of music, and I think people who think about scales are really smart.

Then, when actually writing or reading a score, it’s quite a mess to think about ” Circle of 5th ” in order to identify the key .

Next time, I’d like to teach you a very easy way to determine the Key .

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