F♯ dominant seventh chord on piano

The notes and their roles

F♯ dominant seventh contains F♯, A♯, C♯ and E. 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. F-sharp, A-sharp and C-sharp are three black keys. Their common key color does not make the intervals equal: the lower third is major and the upper third is minor.

Hear the seventh

The seventh here is E. Keeping F♯ · A♯ · C♯ fixed and changing only that note to E♯ produces F♯ 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 F♯4 · A♯4 · C♯5 · E5. Inversions put a different member in the bass while retaining F♯ 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 F♯ dominant seventh together, then as separate notes. Name the major third before looking at the display. Repeat in first inversion and check that A♯ is the bass while F♯ 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.