A dominant seventh chord on piano

The notes and their roles

A dominant seventh contains A, C♯, E and G. From the root, the semitone offsets are 0, 4, 7, 10. The degree formula 1, 3, 5, ♭7 describes each member relative to the root, not its order in a particular voicing.

Read this shape accurately

First inspect the major-triad foundation of this seventh chord. C-sharp supplies the major third above A. Compare the compact A–C-sharp–E shape with C-sharp–E–A to hear the third become the bass without changing the chord quality.

Hear the seventh

The seventh here is G. Keeping A · C♯ · E fixed and changing only that note to G♯ produces A major seventh. Compare both at the same octave and volume so the one-note difference stays easy to hear.

A dominant-seventh chord is a chord quality. Calling it dominant does not, by itself, establish the key or prove that this chord is functioning as V in a progression.

Choose a bass note

The root-position octave example is A4 · C♯5 · E5 · G5. Inversions put a different member in the bass while retaining A as the root. The table gives pitch-class order; move the leading notes up an octave as needed to keep each example ascending.

A short listening check

Play A dominant seventh together, then as separate notes. Name the major third before looking at the display. Repeat in first inversion and check that C♯ is the bass while A remains the root.

1. Choose the displayed root and quality in the chord explorer.
2. Compare root position with one inversion at the same tempo.
3. Save both examples in a named practice collection, or export a reference with note names.