Guitar Chords in the Key of D Major
The chord formula for any Major key is major, minor, minor, major, major, minor, diminished.
The chords in the key of D major are D major, E minor, F# minor, G major, A major, B minor, and C# diminished.
A common way to number these chords is by Roman numerals: I, ii, iii, IV, V, vi, vii. Numerals that represent a major chord are usually capitalized, and minor and diminished chords are lower case.
Related Natural Minor Key