Key
Chords in Db major
Db major is built from the notes Db, Eb, F, Gb, Ab, Bb and C. Its scale carries 5 flats. Harmonising that scale in thirds gives seven chords — 3 majors, 3 minors and 1 diminished — starting on Db as the I. The chord on the fifth degree is Ab, a major V, so Db major has the leading tone that makes a Ab-to-Db cadence sound final.
Beyond those seven, Db major commonly borrows Dbm (i), Ebdim (iiø), Fb (bIII), Gbm (iv) and Abm (v) from the parallel minor — the mixture chords that give a progression somewhere unexpected to go.
The seven chords
Extended to four notes each, the same seven degrees give Dbmaj7, Ebm7, Fm7, Gbmaj7, Ab7, Bbm7, Cm7b5.
Borrowed chords
Capo 6 and play G major shapes to sound Db major.
All eight capo positions for Db major →