Sixth
A major 6th chord is identical to the minor 7th of the relative key (albeit in a different inversion)
- ex. C6 is the same as Am7
- writing a chord as 6th instead of the equivalent 7th is obscuring the harmonic quality of the chord, making it more difficult to know which notes belong.
- there is one exception to this, which is dependent on the context. Imagine we play a
Cmaj7
chord, then drop the 7th to a 6 to play aCmaj6
chord. In this context, theC
still feels like the tonal centre (as it did with theCmaj7
chord). In this case, it's more appropriate to think of that 6th chord as a 6th chord and not a 7th of the relative key.
- there is one exception to this, which is dependent on the context. Imagine we play a
When specifying a minor/major 6th chord, the minor/major refers to the third (meaning the 6th note is the same in both)
6/9 (aka 6add9)
Major
Cmaj6/9: 32223x
It is not a tense chord, and therefore doesn't require resolution.
Considered a substitute for the tonic in Jazz
Minor
Cmin6/9: 32233x
Evokes the dorian mode
Also considered a substitute for the minor tonic in Jazz.
chords are built from scales