View sharps, flats, and relative minor/major keys for all 15 key signatures.
Instead of deriving accidentals from the circle of fifths, Key Signature Reference identifies a standard signature by its sharp or flat count and shows the corresponding major and relative minor keys. It covers 15 signatures, from seven flats through no accidentals to seven sharps, and lists the affected notes. A common mistake is treating the paired keys as two names for one key. They share a written signature, but they have different tonics and tonal centers.
A concrete input and expected output from the current implementation.
Input
3 sharps
Expected output
A major; F# minor; sharps: F#, C#, G#
Sharp signatures accumulate in the order F#, C#, G#, D#, A#, E#, B#. The first three therefore produce the signature shared by A major and its relative minor, F# minor.
The reference spans no accidentals, one through seven sharps, and one through seven flats. Sharps accumulate as F#, C#, G#, D#, A#, E#, B#. Flats accumulate in the reverse letter order: Bb, Eb, Ab, Db, Gb, Cb, Fb. The selected count therefore determines both the affected notes and the standard key pair.
Each signature is paired with one major key and its relative natural minor because their diatonic scales contain the same seven written pitches. The relative minor tonic is a minor third below the major tonic. This pairing describes the signature, not every note that may appear in a composition or its harmonic analysis.
No. Three sharps is the standard signature for both A major and F# minor, and the same pitch collection can support modes or temporary tonal ambiguity. Examine the tonal center, cadences, melody, and harmony to determine the key. This reference supplies the conventional major-relative-minor pairing; it does not analyze the music.
They are different spellings of an enharmonic pitch collection. C# major requires seven sharps, while Db major requires five flats. On an equal-tempered keyboard their corresponding pitches sound the same, but the written note names and signature differ. The reference preserves that notation distinction instead of merging the two keys.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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