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GMC Forum _ THEORY _ How To Build Dim7th Chords

Posted by: The Professor May 8 2013, 03:00 PM

How to Build Diminished 7th Chords

In today’s theory lesson we’ll be looking at how you build dim7 chords, as well as 8 commonly used fingerings for these chords that you can take into the practice and bring into your playing and songwriting.

The dim7 chord can be built by stacking minor 3rd intervals on top of each other.

This means that if you take a root notes like C, you can then build a Cdim7 chord by stacking consecutive m3rd intervals on top of that root.

C to Eb is a m3

Eb to Gb is a m3

Gb to Bbb(A) is a m3

Therefore, C-Eb-Gb-A is a Cdim7 chord. Here is how that looks like on paper.

So, the dim7 chord is built by taking the Root of the chord you want to build, and then placing 3 notes on top of that root all a m3 interval apart.

Test Your Theory Knowledge

To help get this formula under your fingers and into your theory chops, you can write out all 12 different dim7 chords, such as C Eb Gb Bbb for Cdim7, and post them in the comments section of this thread.

I’ll be glad to check your work and help with any questions you have regarding this lesson on building dim7 chords.

dim7 Chord Shapes

To keep things practical as well as theoretical, here are 8 different shapes for Cdim7 that you can take into your guitar playing.

Each of these shapes is commonly used and if you have even a few of them under your fingers will allow you to easily bring these sounds into your playing regardless of the style or musical situation.

Check out dim7 chords from both a construction and practical application.

These chords will pop up from time to time, or a lot if you play blues, jazz or fusion, and so it’s a good idea to have a mental and physical understanding of these common chords.

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