Chords in the key of D major
The chord chart below lists all the common traids and 
four note extended chords belonging to the key of D major. 
Roman numerals indicate each chords position relative to 
the scale.

D major scale notes: D E F# G A B C#
Major key chord sequence: Maj min min Maj Maj min dim
I	ii	iii	IV	V	vi	vii
Dmaj	Emin	F#min	Gmaj	Amaj	Bmin	C#dim
Dmaj7	Emin7	F#min7	Gmaj7	A7	Bmin7	C#m7b5
Common chord progressions in D major
I - IV - V	D - G - A
I - vi - IV - V	D - Bm - G - A
ii - V - I	Em7- A7 - Dmaj7