VISUAL MUSIC THEORY
A major chord is a shape.
Do not start with note lists. Start with the interval law that makes one stable form: 4 + 3.
See the interval form first
Three points. One triangle. One identity that can be moved anywhere on the circle.
Major chord = 4 + 3
This is the identity. Everything else is a reading.
01 · FIRST PRINCIPLE
A chord is not a note list
When you describe a major chord as C–E–G, you get names.
When you describe it as 1–3–5, you get a scale reading.
But when you describe it as 4 + 3, you reach the identity of the chord itself.
That is the layer TerryTrilla starts from.
Intervals come first
Intervals are identity. The circle shows position. Degrees are interpretation.
Then the same form can be read as 1–3–5
Inside a scale, the major form can be translated into degrees. That translation is useful, but it is not the identity itself.
1st degree
The point of rest. The form starts here.
3rd degree
The point that gives the major form its bright character.
5th degree
The point that completes the triangle and closes the object.
Three ways to describe the same chord
Notes give names. Degrees give context. Intervals give identity.
Names
C–E–G
A note list to memorize.
Scale reading
1–3–5
A context inside a scale.
Interval identity
4 + 3
The same structure you can move.
Build 4 + 3 and rotate it
The name changes. The place changes. The interval structure stays the same.
Every major chord keeps the same interval law.
Rotation changes the position, not the identity.
Why the major form feels stable
The major form is triangular because three points are held together by 4 + 3.
It is not perfectly symmetrical. It has direction, balance, and a sense of completion.
That is why the form feels:
- stable
- open
- clear
- resolved
You do not need a long explanation first.
You can understand the chord by seeing the interval form.
Why this changes more than one chord
Once you see the major chord as an interval form, music stops being a pile of disconnected facts.
Transposition becomes rotation. Chords become objects. Scales become contexts. Harmony becomes visible.
The major form is not just one chord.
It is an entrance into a new way of seeing music.
What this really means
Do all major chords really have one form?
Yes. They all keep the same interval law: 4 + 3. Only the position changes.
Why not start with 1–3–5?
Because 1–3–5 depends on a scale. The chord exists before the scale as an interval structure.
Are intervals important?
Yes. Intervals are the identity of the chord. Scale degrees are one way to read that identity.
Why is the middle point so important?
Because it gives the form its character. In a major chord, it appears through the first move of 4 semitones from the root.
See the shape yourself
Open the Scale Circle, build 4 + 3, and rotate the form until you stop seeing separate chords and start seeing one moving structure.