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

B major scale notes: B C# D# E F# G# A#
Major key chord sequence: Maj min min Maj Maj min dim
I	ii	iii	IV	V	vi	vii
Bmaj	C#min	D#min	Emaj	F#maj	G#min	A#dim
Bmaj7	C#min7	D#min7	Emaj7	F#7	G#min7	A#m7b5
Common chord progressions in B major
I - IV - V	B - E - F#
I - vi - IV - V	B - G#m - E - F#
ii - V - I	C#m7 - F#7 - Bmaj7