Key of D Major

Everything the key of D major contains: its scale, its seven diatonic chords, and its closest relatives.

The key of D major is built on the D major scale. Harmonizing that scale in thirds yields its seven diatonic chords: D – Em – F#m – G – A – Bm – C#°. Its relative minor — the key sharing exactly the same notes — is B minor, and its parallel minor is D minor.