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    Circle of Thirds: Visual Tool for Chords in Major or Minor Scales

    In music theory, the Circle of Thirds is a visual tool that helps us remember the order of thirds in a scale and hence the notes of the chords in any given major or minor scale. The circle of thirds is not as popular or versatile as the Circle of Fifths, but it can still be a very useful tool.

    The circle of thirds works because chords in music are built by stacking thirds. For example, major chords are a major third and a minor third, minor chords are a minor third and a major third and diminished chords are two minor thirds.

    The circle is formed by placing the notes of a major or minor scale in order of 3rds instead of in their ascending order of scale degrees.

    By doing this, we are placing the notes of the scale in the following order of scale degrees: 1-3-5-7-2-4-6. The order of natural notes will be C-E-G-B-D-F-A, and then we can add the necessary sharps or flats depending on the scale. When in another key than C, the order won't start from C, but will still be the same overall order when seen as a circle. For example, for A minor: A-C-E-G-B-D-F.

    Select a Scale:

    C E G B D F A Major third Major third Major third minor third minor third minor third minor third

    What Can We Use the Circle of Thirds For?

    We can start from any of the notes in the circle to build triads or 7th chords. For example, if we start from E, we'll know that the triad is E G B and that the seventh chord is E G B D.


    The Circle of Thirds for Reading Music Notation

    On a music staff, every line is a third away distance from the next line, and every space is also a third away from the next space, so remembering the order of thirds allows us to quickly know which note goes with which line or space on the staff, no matter which clef is being used.

    Here are two examples to illustrate this, where you can see that every line or space on the staff is just a third away from the next line or space:

    Lines on the Staff

    Notes on lines of the staff using the treble clef

    Spaces on the Staff

    Notes on spaces of the staff using the treble clef

    Mnemonic Devices to Remember the Order of the Circle of Thirds

    A popular mnemonic device to remember the order of the circle of thirds is GBD FACE.

    Here's another good one, which I learned from Rick Comiskey: Every Good Band Deserves Fans And Cash.

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    Circle of fifths with major and minor keys