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168 | The Circle of Thirds (Ionian)
chord relationships in a major key
November 27, 2022
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Musicians talk alot -- although not as much as they should -- about the Circle of FIFTHS, a powerful diagram for understanding chords in all keys and the relationships between them.

But what about the Circle of THIRDS? What is it ... and how does it work?

In a nutshell, the Circle of Thirds depicts how the chords within a single key are connected. To illustrate, here are the seven chords in the Key of C (a.k.a. the "C Ionian mode"):

As you can see, each chord is derived from the same source scale -- in this case, the C major scale (shown along the top).

  • C major (the major "I" chord) is played by starting on scale degree 1 and combining every other note (C, E, G)
  • D minor (the minor "ii" chord) starts on scale degree 2
  • E minor (the minor "iii" chord) starts on scale degree 3
  • And so on ... to form 7 distinct harmonies

This is useful information because it explains how each chord is created. But if you look closely, there's a special pattern that forms connecting all of the chords in a powerful way.

And that is, when you follow the "every other" pattern that forms a single chord, and continue the sequence, you get an alternating wave of major-third and minor-third intervals, like this:

This sequence alternates through all 7 harmonies in the key -- beginning with C major (I) ... which shares notes with E minor (iii) ... which, in turn, shares notes with G major (V) ... etc., until the pattern returns to C major (I) once again.

Some of the tertian intervals are major-thirds (black lines) while others are minor-thirds (white lines). And the order of these intervals results in the different types of chords that form -- including major triads, minor triads, and a diminished triad.

This pattern repeats because music is inherently cyclical, which we can show by depicting this same sequence of chords in a loop like this:

And as you can see, because of how each triad shares notes, these 7 chords form a seamless, daisy-chain pattern like this:

These relationships between chords -- the way they interconnect, and how they are arranged within a given key -- is powerful. Because these connections inform the kinds of chord progressions you can create. How the harmonies naturally flow together as you craft cool songs, as I explain in detail in the full theory course (found in the content playlists).

But these are only the relationships between chords in the Key of C. What's cool is that these same relationships -- these same consistent connections -- appear in every key, as the next illustrations show....

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354a | Creep (video)

An explanation and PDF is in the following post (354b).

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350 | Extended chords explained

Extended chords are easy to understand -- once you know about the Circle of Thirds.

Essentially, fancy extended chords are built by adding notes incrementally from a key's Circle of Thirds. By including ever more intervals of a third, you can play increasingly more complex harmonies.

Had I only known this in the beginning!

Without the Circle of Thirds, exotic chord names seem mysterious and complicated. WITH the Circle of Thirds, however, everything clicks into place.

🎥 This short video gives you the gist.

For more details on the construction of these chords, check out Lesson 17 in the course: https://mikegeorge.locals.com/post/6051473/296-lesson-17-pdf-video

And the PDF referenced is ChordBook 2 here: https://shop.mycolormusic.com/products/colormusic%E2%84%A2%EF%B8%8F-guitar-chordbook-modebook-bundle

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345a | Theory Course LIVE - heads up

Hey! Join Sunday's stream for the first in the Theory Course LIVE series.

We'll be going through the course lessons page-by-page, playing the exercises, etc. -- with questions, answers, and sidebars along the way. It's a new and insightful look into music theory.

(The live stream link referenced in this video is actually in the NEXT post.)

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363 | Daily Dose

Here's a snapshot of the C Mixolydian mode -- in both pitch space (circular format) and on the guitar fretboard -- which you can play in any octave.

Mixolydian's b7 note gives the pattern a distinctively cool sound, as you can hear when you play it.

The QUESTION is, what is the source scale of this particular mode?

(Hint: Mixolydian starts on the fifth scale degree of its underlying source pattern.)

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361 | Color notation (technical knowledge)

Hey, all -- question for you:
Do you have any thoughts on ways to colorize notation?

Folks regularly ask about software to use. And because we have engineers of various types in our community here, I'm hoping some of us may have ideas, or technical know-how.

I think creating an open source tool for community members is an excellent project! It will be very powerful for dissecting and composing songs. With a tool like this, our collective knowledge will rise exponentially.

See this post for context -- and please tag us if you're interested:
https://mikegeorge.locals.com/post/6059027/hey-all-mikegeorge-ive-been-really-loving-your-lessons-ive-worked-my-way-through-12-of-them?cid=8082688

356 | Harmonic Concept

POLL: If you could master one harmonic concept, which would it be?

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365 | Theory Course LIVE - Session 6

Join us for the sixth session of the theory course live. Today, where we're talking about the visible relationships between notes and intervals. These are fundamental concepts that every songwriter MUST know.

⏰ Time: THURSDAY, May 15 at 6:00 p.m. (UTC-6)

🔗 Link to join:

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364 | Cascading Fourths

Great chord progressions are informed by the circle of fifths / fourths. By simply playing chords of successive fourths in sequence, you can make excellent music.

Weezer's song, "Island in the Sun" is a nice example.

The song cycles through a simple pattern of:  Em - Am - D - G (or chords vi - ii - V - I in the key of G). Within the circle of thirds, you can see that these harmonies progress through states of stability (vi), change (ii), tension (V), and stability once more (I).

But when you look closer at that the root notes of these chords, it's clear that the pattern follows a sequence of successive fourths (Em - Am - D - G):  yellow, orange-yellow, orange, red-orange.

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362 | Theory Course LIVE - Session 5

This week, the Theory Course live stream is on *THURSDAY*.

Join us for the fifth session, where we're talking about notes and intervals -- the true essentials of music theory.

Time: THURSDAY, May 8 at 6:00 p.m. (UTC-6)

Link to join:

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