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The full circle only consists So each movement is a single note difference, always adjusting the leading tone of the 12 tones, which can be arranged like key on the clockwise side of the hours on an analog clockpair. The points opposite each other (12 vs. 6, 3 vs. 9, 11 vs. 5, etc.) are Note that the least relatedmajor scale has two half-steps, while the points nearest which means two notes right next to each other (12 and 1, 1 and 2, etc.) are most related. As we go right Every other major or clockwisenatural minor scale has to contain at least one of these notes, we sharp since the 4th of largest movement between neighboring notes is a whole step. So the current key to get the next keyleast related scales will share 2 notes. For example , C and C{{s}} don't share any notes by name - every note in C Major, sharping is the 4th (F) gives us the scale of G Majorsame note in C{{s}} but sharped. As we left or counter-clockwiseHowever, we flatten the 7th E{{s}} = F and B{{s}} = C in terms of the current key to get the next key. For C Major, we flat the B to get F Majorpitch; so they still have two ''enharmonic'' notes in common.
So each movement is a single note difference. Note that the major scale has two half-steps, which means two notes right next to each other. Every other major or natural minor scale has to contain at least one of these notes, since the largest movement between neighboring notes is a whole step. So the least related scales will share 2 notes. For example, C and C# don't share any notes by name - every note in C is the same note in C# but sharped. However, E# = F and B# = C; so they still have two notes in common.{{top}}
=== Minor to Harmonic Minor ===
→Full Circle
{{Top-Level Crumbs|1}}{{Lesson Crumbs|2}}{{Intermediate Lesson Crumbs|8}} The '''circle of fifths ''' lays out the 12 tones in a circle, just like the 12 hours on an analog clock face, moving clockwise in perfect fifths(or counter-clockwise in perfect 4ths which are inverted perfect 5ths). If C is 12 o'clock, its fifth, G, is 1 o'clock. G's fifth, D, is two o'clock. And so on. ::{|| || F || C || G || |-| B{{f}} || || || || D|-| E{{f}} || || || || A|-| A{{f}} || || || || E|-| || D{{f}} || G{{f}} || B || |}
==Inter-relation of Keys==
{{Crumbs|blue|1
|Circle of Fifths#Inter-relation of Keys|Inter-relation of Keys
|Circle of Fifths#Full Circle|Full Circle
|Circle of Fifths#Modulation|Modulation
|Circle of Fifths#Minor Keys|Minor Keys
|Circle of Fifths#Modulating Between Types of Scales|Between Scale Types
}}
So far we've really only talked about C Major and A minor, which are composed of the 7 white keys per octave on the piano. But scales can be built upon any of the 12 tones in the chromatic scale. We know the whole-half patterns of the major and minor scales, so we can figure out what notes any scale has, but what about the interrelation between scales? This is where the circle of fifths helps to keep things in perspective.
G - A - B - C - D - E - F# - G
F and C Major differ by only one note (C Major has a B while F Major has a BbB{{b}}). Similarly, C and G also differ by one note (F vs. F#{{s}}). Let's look at the whole-half patterns:
w w h w w w h
F - G - A - Bb - C - D - E - F
w w h w w w h w w h w w w h
C - D - E - F - G - A - B - C - D - E - F - G - A - B - C
G - A - B - C - D - E - F# - G
The whole-half pattern from F to F in the key of C Major is w-w-w-h-w-w-h. If we flatten flat the 4th note, the B, we get w-w-h-w-w-w-h - the major scale pattern.
The whole-half pattern from G to G in the key of C Major is w-w-h-w-w-h-w. If we sharp the 7th note, the F, we get w-w-h-w-w-w-h - the major scale pattern.
Remember that F is a fifth below C and G is a fifth above. We notice that if we change the key by moving in the root note by perfect fifths, only one note changes. While no two major scales will have different tonic notes but identical sets of notes, some scales are more ''inter-related'' or relatively harmonic than others.
The circle of fifths lists keys in 5ths, which is useful to determine how interrelated any two keys are. The points opposite each other (12:00 vs. 6:00, 3:00 vs. 9:00, 11:00 vs. 5:00, etc.) are the least related, while the points nearest each other (12:00 and 1:00, 1:00 and 2:00, etc.) are most related. As we go right or clockwise, we sharp the 4th of the current key to get the next key. For example in C Major, sharping the 4th (F) gives us the scale of G Major. As we move left or counter-clockwise, we flatten the 7th of the current key to get the next key. For C Major, we flat the B to get F Major.
== Full Circle ==
{{Crumbs|blue|2
|Circle of Fifths#Inter-relation of Keys|Inter-relation of Keys
|Circle of Fifths#Full Circle|Full Circle
|Circle of Fifths#Modulation|Modulation
|Circle of Fifths#Minor Keys|Minor Keys
|Circle of Fifths#Modulating Between Types of Scales|Between Scale Types
}}
Let's find all 12 tones in order of fifths, going both ways from C:
C
Db - Ab - Eb - Bb - F - C - G - D - A - E - B
Gb - Db - Ab - Eb - Bb - F - C - G - D - A - E - B - F#
F# {{s}} is the same pitch as GbG{{b}}, which means we've completed the circle. If we keep going, we still get unique key names, but the pitches will match other keys already in the circle. For example, continuing left (counter-clockwise), we reach CbC{{b}}, which is the same as B. Going right (clockwise), we reach C#{{s}}, which is the same as DbD{{b}}. So assuming C is "12 o'Clock", our circle of fifths looks like this::{||-!align="center"| Least {{s}}/{{b}} !! Clockwise !! Counter-Clockwise|-|:{|| || F || C || G || |-| B{{f}} || || || || D|-| E{{f}} || || || || A|-| A{{f}} || || || || E|-| || D{{f}} || G{{f}} || B || |}|:{|| || E{{s}} || C || G || |-| A{{s}} || || || || D|-| D{{s}} || || || || A|-| G{{s}} || || || || E|-| || C{{s}} || F{{s}} || B || |}|:{|| || F || C || A{{db}} || |-| B{{f}} || || || || E{{db}}|-| E{{f}} || || || || B{{db}}|-| A{{f}} || || || || F{{b}}|-| || D{{f}} || G{{f}} || C{{b}} || |}|}
{| class="wikitable"
|-
! Key !!Cb C{{b}} !! Gb G{{b}} !! Db D{{b}} !! Ab A{{b}} !! Eb E{{b}} !! Bb B{{b}} !! F !! C !! G !! D !! A !! E !! B !! F# {{s}} !! C#{{s}}
|-
| Flats/Sharps||7 {{b}}'s||6 {{b}}'s || 5 {{b}}'s || 4 {{b}}'s || 3 {{b}}'s || 2 {{b}}'s || 1 {{b}}'s || 0 {{b}}/#{{s}}'s || 1 #{{s}}'s || 2 #{{s}}'s || 3 #{{s}}'s || 4 #{{s}}'s || 5 #{{s}}'s || 6 #{{s}}'s || 7 #{{s}}'s
|-
! Unison ||Cb C{{b}} || Gb G{{b}} || Db D{{b}} || Ab A{{b}} || Eb E{{b}} || Bb B{{b}} || F || C || G || D || A || E || B || F# {{s}} || C#{{s}}
|-
| 2nd ||Db D{{b}} || AbA{{b}}|| Eb E{{b}} || Bb B{{b}} || F || C || G || D || A || E|| B || F#{{s}}|| C# {{s}} || G# {{s}} || D#{{s}}
|-
| 3rd ||Eb E{{b}} || Bb B{{b}} || F || C || G || D || A || E || B || F# {{s}} || C# {{s}} || G#{{s}}|| D# {{s}} || A# {{s}} || E#{{s}}
|-
! 4th ||Fb F{{b}} || Cb C{{b}} || Gb G{{b}} || Db D{{b}} || Ab A{{b}} || Eb E{{b}} || Bb B{{b}} || F || C || G || D || A|| E || B || F#{{s}}
|-
| 5th ||Gb G{{b}} || Db D{{b}} || Ab A{{b}} || Eb E{{b}} || Bb B{{b}} || F || C || G || D || A || E|| B|| F# {{s}} || C# {{s}} || G#{{s}}
|-
| 6th ||Ab A{{b}} || Eb E{{b}} || Bb B{{b}} || F || C || G || D || A || E || B || F#{{s}}|| C#{{s}}|| G# {{s}} || D# {{s}} || A#{{s}}
|-
! 7th ||Bb B{{b}} || F || C || G || D || A || E || B || F# {{s}} || C# {{s}} || G#{{s}}|| D#{{s}}|| A# {{s}} || E# {{s}} || B#{{s}}
|-
| Oct ||Cb C{{b}} || Gb G{{b}} || Db D{{b}} || Ab A{{b}} || Eb E{{b}} || Bb B{{b}} || F || C || G || D || A|| E|| B || F# {{s}} || C#{{s}}
|}
Above is the list of the keys from Cb C{{b}} to C#{{s}}. Note that this is actually 15 tones. Since C# {{s}} = DbD{{b}}, Cb C{{b}} = B, and F# {{s}} = GbG{{b}}, we can eliminate them, leaving with only the 12 distinct tones on the circle of fifths. {{top}}
== Modulation ==
{{Crumbs|blue|3|Circle of Fifths#Inter-relation of Keys|Inter-relation of Keys|Circle of Fifths#Full Circle|Full Circle|Circle of Fifths#Modulation|Modulation|Circle of Fifths#Minor Keys|Minor Keys|Circle of Fifths#Modulating Between Types of Scales|Between Scale Types}} '''Modulation''' is the practice of changing keys. The source and destination keys are important. Many composers only modulate into destination keys based on the 4th or 5th of the source key, as these are the most harmonic keys.
Below is a table to show the most interrelated keys. It says how many notes the two keys will have in common, modulating to the key of the named interval above the current key. For example, the key of C Major will only have 2 notes in common with the major keys a M7, m2, or d5 above C (Cb C{{f}} or B Major, C# {{s}} or Db D{{f}} Major, and Gb G{{f}} or F# {{s}} Major).
{| class = "wikitable"
== Minor Keys ==
{{Crumbs|blue|4
|Circle of Fifths#Inter-relation of Keys|Inter-relation of Keys
|Circle of Fifths#Full Circle|Full Circle
|Circle of Fifths#Modulation|Modulation
|Circle of Fifths#Minor Keys|Minor Keys
|Circle of Fifths#Modulating Between Types of Scales|Between Scale Types
}}
=== Natural Minor ===
So far I have always discussed the circle of fifth in terms of major keys. Since natural minor keys have the same notes as their relative major, the same rules apply. Other natural minor keys based on the 4th or 5th of the current natural minor key will have one note difference, and the 3 keys opposite the current key are the last related with 5 notes different.
=== Harmonic Minor ===
Harmonic minor is a bit different. The M7 does not carry over to the next key in sequence. For example, in A Harmonic Minor, there is a G#{{s}}. But in the key a fifth above, E Harmonic Minor, there is a G. Similarly, a fifth below A is D. D Harmonic minor has a G as well.
{| class="wikitable"
|-
! Key !!Ab A{{f}} !! Eb E{{f}} !! Bb B{{f}} !! F !! C !! G !! D !! A !! E !! B !! F# {{s}} !! C# {{s}} !! G# {{s}} !! D# {{s}} !! A#{{s}}
|-
| Uni ||Ab A{{f}} || Eb E{{f}} || Bb B{{f}} || F || C || G || D || A || E || B || F#{{s}}|| C#{{s}}|| G# {{s}} || D# {{s}} || A#{{s}}
|-
! 2nd ||Bb B{{f}} || F || C || G || D || A || E || B || F# {{s}} || C# {{s}} || G#{{s}}|| D#{{s}}|| A# {{s}} || E# {{s}} || B#{{s}}
|-
! 3rd ||Cb C{{f}} || Gb G{{f}} || Db D{{f}} || Ab A{{f}} || Eb E{{f}} || Bb B{{f}} || F || C || G || D || A|| E|| B || F# {{s}} || C#{{s}}
|-
| 4nd ||Db D{{f}} || AbA{{f}}|| Eb E{{f}} || Bb B{{f}} || F || C || G || D || A || E|| B || F#{{s}}|| C# {{s}} || G# {{s}} || D#{{s}}
|-
| 5rd ||Eb E{{f}} || Bb B{{f}} || F || C || G || D || A || E || B || F# {{s}} || C# {{s}} || G#{{s}}|| D# {{s}} || A# {{s}} || E#{{s}}
|-
! 6th ||Fb F{{f}} || Cb C{{f}} || Gb G{{f}} || Db D{{f}} || Ab A{{f}} || Eb E{{f}} || Bb B{{f}} || F || C || G || D || A|| E || B || F#{{s}}
|-
! 7th ||G || D || A || E || B || F# {{s}} || C# {{s}} || G# {{s}} || D# {{s}} || A# {{s}} || E#{{s}}|| B#{{s}}|| F## {{ds}} || C## {{ds}} || G##{{ds}}
|-
| Oct ||Ab A{{f}} || Eb E{{f}} || Bb B{{f}} || F || C || G || D || A || E || B || F#{{s}}|| C#{{s}}|| G# {{s}} || D# {{s}} || A#{{s}}
|}
{| class = "wikitable"
|-
! Key !! Eb E{{f}} !! Bb B{{f}} !! F !! C !! G !! D !! A !! E !! B !! F# {{s}} !! C# {{s}} !! G# {{s}} !! D#{{s}}
|-
! Notes in<br />common w/ A
== Modulating Between Types of Scales ==
{{Crumbs|blue|5
|Circle of Fifths#Inter-relation of Keys|Inter-relation of Keys
|Circle of Fifths#Full Circle|Full Circle
|Circle of Fifths#Modulation|Modulation
|Circle of Fifths#Minor Keys|Minor Keys
|Circle of Fifths#Modulating Between Types of Scales|Between Scale Types
}}
Often a modulation desires to move from a major to minor or harmonic minor tonality, or vice versa. This changes which keys will be most and least harmonic.
=== Major to Minor ===
{{Crumbs|blue2|1
|Circle of Fifths#Major to Minor|Major to Minor
|Circle of Fifths#Major to Harmonic Minor|Major to Harmonic Minor
|Circle of Fifths#Minor to Major|Minor to Major
|Circle of Fifths#Minor to Harmonic Minor|Minor to Harmonic Minor
|Circle of Fifths#Harmonic Minor to Major|Harmonic Minor to Major
|Circle of Fifths#Harmonic Minor to Minor|Harmonic Minor to Minor
}}
{| class = "wikitable"
|-
|-
!2
| || m6, m7, m3 || C -> AbmA{{f}}m|} === Major to Harmonic Minor ==={{Crumbs|blue2|2|Circle of Fifths#Major to Minor|Major to Minor|Circle of Fifths#Major to Harmonic Minor|Major to Harmonic Minor|Circle of Fifths#Minor to Major|Minor to Major|Circle of Fifths#Minor to Harmonic Minor|Minor to Harmonic Minor|Circle of Fifths#Harmonic Minor to Major|Harmonic Minor to Major|Circle of Fifths#Harmonic Minor to Minor|Harmonic Minor to Minor}} {| class = "wikitable"|- !Common<br>Notes !! Diatonic<br>Keys !! Non-Diatonic<br>Keys !! Example|-!6 | M6 || || C -> Ahm|- !5 | M2, M3 || || C -> Dhm|- !4 | U, M7 || d5, m7 || C -> Chm|- !3 | P4, P5 || m2, m3, m6 || C -> Ghm
|}
=== Minor to Major ===
{{Crumbs|blue2|3
|Circle of Fifths#Major to Minor|Major to Minor
|Circle of Fifths#Major to Harmonic Minor|Major to Harmonic Minor
|Circle of Fifths#Minor to Major|Minor to Major
|Circle of Fifths#Minor to Harmonic Minor|Minor to Harmonic Minor
|Circle of Fifths#Harmonic Minor to Major|Harmonic Minor to Major
|Circle of Fifths#Harmonic Minor to Minor|Harmonic Minor to Minor
}}
{| class = "wikitable"
|-
|}
=== Major Minor to Harmonic Minor ==={{Crumbs| class = "wikitable"blue2|4|- !Common<br>Notes !! Diatonic<br>Keys !! Non-Diatonic<br>Keys !! ExampleCircle of Fifths#Major to Minor|-!6 Major to Minor| M6 Circle of Fifths#Major to Harmonic Minor|Major to Harmonic Minor| Circle of Fifths#Minor to Major|| C -> AhmMinor to Major|- !5 Circle of Fifths#Minor to Harmonic Minor| M2, M3 || || C -> DhmMinor to Harmonic Minor|- !4 Circle of Fifths#Harmonic Minor to Major| U, M7 || d5, m7 || C -> ChmHarmonic Minor to Major|- !3 Circle of Fifths#Harmonic Minor to Minor| P4, P5 || m2, m3, m6 || C -> GhmHarmonic Minor to Minor|}}
{| class = "wikitable"
|-
=== Harmonic Minor to Major ===
{{Crumbs|blue2|5
|Circle of Fifths#Major to Minor|Major to Minor
|Circle of Fifths#Major to Harmonic Minor|Major to Harmonic Minor
|Circle of Fifths#Minor to Major|Minor to Major
|Circle of Fifths#Minor to Harmonic Minor|Minor to Harmonic Minor
|Circle of Fifths#Harmonic Minor to Major|Harmonic Minor to Major
|Circle of Fifths#Harmonic Minor to Minor|Harmonic Minor to Minor
}}
{| class = "wikitable"
|-
=== Harmonic Minor to Minor ===
{{Crumbs|blue2|6
|Circle of Fifths#Major to Minor|Major to Minor
|Circle of Fifths#Major to Harmonic Minor|Major to Harmonic Minor
|Circle of Fifths#Minor to Major|Minor to Major
|Circle of Fifths#Minor to Harmonic Minor|Minor to Harmonic Minor
|Circle of Fifths#Harmonic Minor to Major|Harmonic Minor to Major
|Circle of Fifths#Harmonic Minor to Minor|Harmonic Minor to Minor
}}
{| class = "wikitable"
|-
| m6, M2 || M3, d5, m2 || Ahm -> Fm
|}
== Homework ==
* Memorize traversing the entire circle of fifths, moving both clockwise and counter-clockwise.
* Understand the concept of modulation.
* Understand that the circle of fifths demonstrates how inter-related any two keys are by their proximity on the circle.
* Know how inter-related keys are when switching from minor to major, or vice versa.
== Q & A ==
== Related Lessons ==
* [[Music Theory Basics]]
* [[Modulation]]
* [[Equal Temperament and Alternate Tunings]]
{{top}}
{{Intermediate Lesson Crumbs|8}}
[[Category:Guitar]]
[[Category:Intermediate Lessons]]
[[Category:Harmony]]
[[Category:Theory]]