Guitar chords in the key of C# or Db:
Chord Db9-5 (8th fret) notes: Db, F, Cb, Eb, Abb and Db. (Abb is A double sharp or G and Cb=B).
This chord is played by placing a barre on fret eight with your index finger.
Db(C#) dominant 9th b5 guitar chord's alternative names: Db7(b5,9), Db9b5.
1(C#/Db), 3(F), b5(G/Abb), b7(B/Cb), 9(D#/Eb).