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→Diatonic Chords
Gm, A, and Bm are ''not'' diatonic to C Major. G Minor has a Bb, A has a C#, and Bm has a F#. Bb, C#, and F# are not found in C Major.
Let's compare to G Major, which has the exact same notes as C Major, except an F# instead of F.
{|class="wikitable"
|+ Diatonic Chords in the Key of G Major
! Scale<br>Degree !! Chord !! Root !! 3rd !! 5th
|-
| 1 || G || G || B || D
|-
| 2 || Am || A || C || E
|-
| 3 || Bm || B || D || F#
|-
| 4 || C || C || E || G
|-
| 5 || D || D || F# || A
|-
| 6 || Em || E || G || B
|-
| 7 || F° || F# || A || C
|}
Changing that one note (F -> F#) affects 3 of the chords. B° becomes Bm, Dm becomes D, and F becomes F°. Notice that G, Am, C, and Em are diatonic to both C Major and G Major.
== Harmonic Functions ==