Brighter and tighter — where barre chords start to matter.
See how all seven chords sit together, and hear what makes each degree do its job.
Open D Major in the Studio →The key of D Major contains D, Em, F#m, G, A, Bm, C#dim. In Roman numerals that's I, ii, iii, IV, V, vi, vii° — the tonic (D) is home, and the dominant (A) creates the tension that resolves back to it.
Slightly, and for one reason: two of its seven chords (F♯m and Bm) are full barre chords, where C and G major get by almost entirely on open shapes. If your barre technique is solid, D is no harder — it's the usual key people graduate to next.