However, if it were a Ddim7 (spelled D-F-Ab-B) it would be non-diatonic by structure, since the fully-diminished chord is not found in any key. If you are playing in C Major and you see a D7 (spelled D-F#-A-C) then it would be non-diatonic by context, since the D7 is native to the key of G Major. A chord can be non-diatonic by structure or by context. Most songs of any complexity will have chords that are non-diatonic. Non-Diatonic refers to any notes or chords that are not native to the key. Therefore any chords built using pitches of the C Major scale (CMaj7, Dmin7, Emi7, FMaj7, G7, Amin7, B7b5) are also diatonic to C Major. Any notes that exist in a C Major scale are diatonic to C Major. Diatonic, literally meaning " through tones" in ancient Greek, is used commonly to refer to notes or chords that are part of, or native to a key center.
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