Adding Extensions to Diatonic 7th Chords: Tonic Chord

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Adding Extensions to Diatonic 7th Chords: Intro Adding Extensions to Diatonic 7th Chords: ii Chord...

There is are a couple basic rules to follow when thinking about which extensions can be used. (but rules are meant to be broken :) .....sometimes)

#1 extension notes cannot be a half step above a chord tone.

#2 extension notes should not create a tritone (b5) with a chord tone.

With our tonic chord or "one" chord, we have two extensions that are available and one avoid note.

We can add the 9 and 13 but the 11 creates a tritone between the 7 & 11 and is also a half step above the 3rd.

Extensions - 9 & 13

Avoid notes - 11