D♭ major
The major key with the tonic D♭. Its key signature has five flats: B♭, E♭, A♭, D♭ and G♭. On the piano it sounds exactly like C♯ major with seven sharps, but it is almost always written as D♭ major.
- Tonic
- D♭
- Key signature
- 5 ♭ (B♭, E♭, A♭, D♭, G♭)
- Tonic chord
- D♭–F–A♭
- Dominant
- A♭ major, A♭–C–E♭
- Subdominant
- G♭ major, G♭–B♭–D♭
- Relative key
- B♭ minor
- Enharmonically the same
- C♯ major
Five flats, almost only black keys
D♭ major lies on the circle of fifths at the lower edge, among the keys with many sharps or flats. Its five flats appear in the order B♭, E♭, A♭, D♭, G♭. That is the fixed order of the flats.
D♭ major scale
Six of the eight notes carry a flat. Only F and C are natural notes. On the piano five of the seven notes lie on black keys, unusually many for a major scale.
The scale begins on D♭, a black key. Of the seven notes D♭, E♭, G♭, A♭ and B♭ are black keys, only F and C are white. The hand therefore has to adjust to the shape of the keys differently than in C major. The exercise page Name the Note recommends deliberately practising awkward keys such as D♭ major and F♯ major as well.
D♭ major or C♯ major?
C♯ major has seven sharps, D♭ major five flats. On the piano both keys consist of the same twelve equal-tempered notes. This is called enharmonic equivalence. On the page Circle of Fifths it says that composers choose the spelling with fewer sharps or flats where possible: D♭ major is almost always preferred to C♯ major.
If you have to choose between the names as a player, pay attention to the context. If a lead sheet shows a D♭ major chord and someone fingers C♯ major, it sounds the same, but the next line may no longer fit the score. The page Enharmonic Matching describes that as a typical trap.
The chords of D♭ major
On every degree a triad arises from two stacked thirds. In D♭ major the degrees I, IV and V are major chords: D♭, G♭ and A♭. On the degrees ii, iii and vi there are minor chords, on the seventh a diminished triad. The derivation for C major and A minor is on the page Diatonic chords; the table here transfers it to D♭ major.
| Degree | Chord | Notes |
|---|---|---|
| I | D♭ | D♭–F–A♭ |
| ii | E♭m | E♭–G♭–B♭ |
| iii | Fm | F–A♭–C |
| IV | G♭ | G♭–B♭–D♭ |
| V | A♭ | A♭–C–E♭ |
| vi | B♭m | B♭–D♭–F |
| vii° | C° | C–E♭–G♭ |
The highlighted chords are the main functions tonic, subdominant and dominant.
The sequence D♭ – G♭ – A♭ – D♭ is the simplest cadence of the key. Further closing formulas are on the page Cadences.
D♭ major as the target of a chord
In the article The diminished seventh there is an example of the ambiguity of this chord: C–E♭–G♭–A resolves to D♭ major if you read C as the leading tone that wants to go a semitone up to D♭. Read the notes differently and the same chord leads to E major, G major or B♭ major.
D♭ major in the sheet music archive
The archive has a song with five flats in the key signature. It is a good example that musical notation and chord notation do not always choose the same spelling:
Voice and piano
-
Die Forelle Franz Schubert · voice and piano, with chords for guitar · 5 pages
Five flats in the key signature, 2/4, “Etwas lebhaft” (somewhat lively). The chord symbols above the vocal line write the tonic as C♯ instead of D♭, the dominant as A♭ and A♭7. C♯ also appears in the last system. The piece ends with a broken chord with a fermata.
The key signature follows D♭ major, the labelling for guitar writes the same tonic with a sharp. Both names denote the same chord.
Common mistakes
- Equating C♯ and D♭: On the piano they sound the same; in notation each spelling has its own key and its own context.
- Stopping a flat key signature too early: Five flats mean B♭, E♭, A♭, D♭, G♭. If the G♭ is missing, the key is A♭ major, with four flats.
- Writing the G♭ as F♯: The key signature of D♭ major contains G♭, not F♯.
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Related terms
C♯ majorB♭ minorA♭ majorG♭ majorRelative keyMajorTonicDominantSubdominantDiatonic chordCircle of fifthsKeyAccidentalEnharmonic equivalencePentatonic scale
Editor: Maik Krohm · reviewed on 3 October 2026
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