Our focus in this lesson is on the interval cycle of fourths and fifths.
It’s very possible you’ve come across the term “circle of fifths and fourths” and are probably wondering if that’s what I intend to share on in this blog. Well the only way to find out is to keep reading.
For now, let’s start out by learning what an interval cycle is.
“What Is An Interval Cycle?”
An interval cycle consists of a sequence of notes starting from a given note and ascending with a fixed interval between successive notes until the given note is reached.
For example, we can start from C:
…and ascend with a fixed interval (which could be a second, third, fourth, etc.) until C is reached.
So, the cycle starts and ends on the same note — just like the example I gave from C to C.
“So, Why Is It Called An Interval Cycle?”
It’s called an interval cycle because the distance between successive notes in the cycle is based on a fixed interval.
Today, we are looking at interval cycles of fifths and fourths and this implies that the distance between successive tones in the cycle are fifth and fourth intervals respectively.
Let’s take a closer look.
Explained: The Interval Cycle Of Fifths
Before we go any further, let’s refresh our minds on the perfect fifth interval.
A Short Note On The Perfect Fifth Interval
The perfect fifth interval is a product of the relationship between the first and fifth tones of the major scale. Using the C major scale (as a reference):
The first and fifth tones (which are C and G):
…when played together produces a perfect fifth interval.
“Check Out All The Perfect Fifth Intervals On The Keyboard…”
The C perfect fifth interval:
The Db perfect fifth interval:
The D perfect fifth interval:
The Eb perfect fifth interval:
The E perfect fifth interval:
The F perfect fifth interval:
The Gb perfect fifth interval:
The G perfect fifth interval:
The Ab perfect fifth interval:
The A perfect fifth interval:
The Bb perfect fifth interval:
The B perfect fifth interval:
Now we’ve refreshed our minds on the perfect fifth interval, let’s continue with the interval cycle of fifths.
The Interval Cycle Of Fifths
The interval cycle of fifths consists of a sequence of notes based on perfect fifth intervals starting from a given note.
Starting from C:
…the interval cycle of fifths can be derived by ascending in perfect fifth intervals. Check out some of the perfect fifth intervals starting from C:
C to G:
G to D:
D to A:
A to E:
E to B:
B to F#:
…etc.
So, here’s a sequence of notes that belong to the interval cycle of fifths (as much as our virtual keyboard can take):
…however, here are all the notes in the interval cycle of fifths starting from C:
C G D A E B F#/Gb Db Ab Eb Bb F C
Quick Insights On The Interval Cycle Of Fourths
It’s also important for us to discuss briefly on perfect fourth intervals before we proceed.
A Short Note On The Perfect Fourth Interval
The perfect fourth interval is a product of the relationship between the first and fourth tones of the major scale.
In the C major scale:
…the first and fifth tones are C and F:
When played together, C and F produces a perfect fourth interval.
“Check Out All The Perfect Fourth Intervals On The Keyboard…”
The C perfect fourth interval:
The Db perfect fourth interval:
The D perfect fourth interval:
The Eb perfect fourth interval:
The E perfect fourth interval:
The F perfect fourth interval:
The Gb perfect fourth interval:
The G perfect fourth interval:
The Ab perfect fourth interval:
The A perfect fourth interval:
The Bb perfect fourth interval:
The B perfect fourth interval:
Let’s go ahead and learn more about the interval cycle of fourths.
The Interval Cycle Of Fourths
The interval cycle of fourths consists of a sequence of notes based on perfect fourth intervals starting from a given note.
Starting from C:
…the interval cycle of fourth can be derived by ascending in perfect fourth intervals. Check out some of the perfect fourth intervals starting from C:
C to F:
F to Bb:
Bb to Eb
Eb to Ab:
Ab to Db:
Db to Gb:
F# to B:
B to E:
E to A:
…etc.
So, here’s a sequence of notes that belong to the interval cycle of fourths (as much as our virtual keyboard can take):
…however, here are all the notes in the interval cycle of fourths starting from C:
C F Bb Eb Ab Db Gb/F# B E A D G C
Final Words
From what we’ve covered in this lesson, you’ve clearly seen that indeed the following interval cycles exist:
The interval cycle of fifths
The interval cycle of fifths
If there’s a cycle of fifths and a cycle of fourths, why then do we say “circle of fifths” and “circle of fourths”?
I’ll tell you why this is so in a subsequent blog post. But for now, go ahead and master the interval cycles because they are the basis of cyclical chord progressions. Heck, the 2-5-1 chord progression is based on the interval cycle of fifths and fourths.
See you in the next lesson!
Chuku Onyemachi
Latest posts by Chuku Onyemachi (see all)
- The Formation Of Diminished Seventh Chords Used To Be Challenging Until I Did This
- How To Form Seventh Chords In Two Shakes Of A Dog’s Tail Using Third Intervals And The Circle Of Fifths Chart
- I Played The 13sus4 Chord And This Happened…
- How To Build Seventh Chords Like An Architect Using “Foundation And Structure” Concept
- This 4-Week Plan Will Help You Master All The Major Scales
Comments on this entry are closed.