Uploaded March 2023 | Updated September 2026, 5 days ago

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Modulate to no less than 8 keys with just one full diminished 7 chord. This called: The diminished portal chord. Changing keys was never so easy. In this music theory guitar lesson you learn that the diminished portal chord relies on the symmetrical structure of diminished 7 chord. This typical structure of a full diminished chord results in some awesome modulation techniques. One of the properties of the diminished chord is that it can be used to modulate very easy to 8 different major and minor keys and even to different modes of the major scale. In this guitar tutorial you’ll find practical examples with tablature. This modulation technique is used in many style like Jazz, Fusion, Rock, Metal, Pop and Blues.

*Subjects in this video:*
- Diminished chords music theory
- The diminished chord.
- The diminished portal.
- How to change keys.
- Changing keys is easy
- The diminished portal chord.
- Modulation technique with the diminished chord.
- Dim7 (full diminished chords).
- Diminished chord as a dominant chord.
- Jazz guitar modulation.
- Jazz chord progressions .
- Chord theory and diminished chord theory.

*Chapters:*
0:00 Introduction
1:25 What is a diminished chord
3:41 Chord shapes
4:33 Diminished chord in the major scale
6:23 Diminished chord in the minor scale
8:23 The portal – method 1
11:48 The portal – method 2 (Pro)
16:00 Shameless self-promotion
16:00 The nerdy chapter
18:55 Conclusion

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(c)2023 Rob van Hal, Netherlands

Photo of portal by Genty C00 license:
pixabay.com/nl/users/genty-2604684