Diatonic Extensions: 7ths, 9ths, 11ths & 13ths (Theory for Intermediate Pianists)
Diatonic Extensions: 7ths, 9ths, 11ths & 13ths (Theory for Intermediate Pianists)
In this lesson, I break down how to build and use diatonic chord extensions—7ths, 9ths, 11ths, and 13ths—in the key of C major. I cover major 7, minor 7, dominant 7, minor 7 flat 5, sharp 11, and add9 chords, while explaining functional harmony, chord spelling, upper structure triads, and sus chords. Whether you're playing gospel, jazz, or CCM, this is essential theory for intermediate pianists learning how to apply extended harmony musically and correctly.
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CHAPTERS:
00:00 - Intro & Real-World Use of Sharp 11 Chords
00:43 - What Are Diatonic Extensions?
02:22 - Building Diatonic 7th Chords in C Major
04:10 - Minor 7♭5 vs Half-Diminished Explained
06:09 - Fully Diminished 7th Chords
08:03 - Understanding Diatonic 9th Chords
10:23 - Why the iii Chord Doesn’t Have a Diatonic 9th
11:08 - Building Major 9 and Dominant 9 Chords
12:51 - Diatonic vs Sharp 11: When and Why
14:33 - Upper Structure Triads & Major 9sus4 Voicings
16:15 - Add11 vs 11th Chords Explained
17:37 - The Only Diatonic Sharp 11 Chord
18:56 - Using Sharp 11 in Contemporary Worship Songs
19:39 - Avoiding Clashes with 11ths on Dominant 7s
21:27 - Gospel Piano Example: “This Is the Day”
22:04 - Minor 11th and Cluster Voicings on vi Chord
23:31 - Introduction to Diatonic 13th Chords
25:27 - Diatonic Limits of the iii and vi Chords
27:17 - Final Thoughts on Usage vs Theory
28:08 - PDF Resources & All 12 Keys Available
29:21 - Learn More Inside the Full Gospel Piano Program