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→Diatonic Chords
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Note that simply because the root of a chord is in the scale doesn't mean that any chord with that root is diatonic to the key. Gm, A, and Bm all have roots in C Major but are ''not'' diatonic to C Major. Gm has a B{{flat}}, A has a C{{sharp}}, and Bm has a F{{sharp}}. B{{flat}}, C{{sharp}}, and F{{sharp}} are not found in the key of C Major.
Let's compare C Major to G Major, which has the exact same notes as C Major except an F{{sharp}} instead of F. Changing that one note (F -> F{{sharp}}) affects 3 of the chords. B{{dim}} becomes Bm(d5 -> P5), Dm becomes D(m3 -> M3), and F becomes F{{dim}}(the raised root changes both intervals: M3 -> m3, P5 -> d5). Notice that G, Am, C, and Em are diatonic to both C Major and G Major, as none of these chords contain F or F{{s}}.
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