Db7 Dominant 7th Chord

The Db Dominant 7th chord contains: C#, F, G#, B.

These notes are derived by applying the dominant 7th interval formula (0–4–7–10 semitones) to the root note C#.

A major triad with a minor seventh.

Creates harmonic tension that resolves to the tonic. The Db7 chord is used across pop, rock, jazz, and classical music. As the I chord in the key of C# major, it functions as the most stable resting point in progressions.

On piano, play C#, F, G#, B simultaneously.

In root position, C# is the lowest note. Inversions move the bass note up — first inversion has F lowest, second inversion has G# lowest.

A dominant 7th chord has 4 notes: C#, F, G#, B (in C#).

It is a 7th chord, extending beyond the basic triad.

The C# major chord (C#–F–G#) uses a major third (4 semitones), giving it a bright, happy sound.

The C# minor chord (C#–E–G#) uses a minor third (3 semitones), giving it a darker, emotional sound.

Db7 naturally serves as the I chord in the key of C# major.

It also appears as IV in the key of G# major, and as V in the key of F# major.

Yes.

The ukulele uses GCEA tuning with 4 strings. The Db7 chord notes (C#, F, G#, B) can be fretted on a ukulele, though the shapes differ from guitar due to the 4-string layout and shorter scale.

In the key of C# major, Db7 pairs naturally with F# major (IV), G# major (V), and A#m (vi).

The classic I–IV–V (Db7–F#–G#) is the foundation of blues, country, and rock.

An inversion places a non-root note in the bass.

Db7 root position: C# in bass. First inversion: F in bass. Second inversion: G# in bass. Inversions create smoother bass line movement without changing the harmony.

Remember the formula: 0–4–7–10 semitones from root.

For Db7: start on C#, add 4 semitones, then 7 semitones, then 10 semitones. Practicing this across all 12 roots builds instant recognition of any dominant 7th chord.