Guitar chords in the key of D major:
Chord Ddim7 (7th fret) notes: F, B, D, Ab and B. You should not play the 6th string.
This chord is played by placing a barre on fret seven with your index finger.
Ddim7 - D diminished seventh guitar chord's alternative names: D°, D°7, Do7, D7dim. See also: Ddim and Dm7b5.
Steps: 1-b3-b5-6(or bb7).
1(D), b3(F), b5(G#/Ab), 6(B).