# Relative key
A **relative key** is a major or minor key that shares the same key signature and diatonic pitch collection as another key but has a different tonic: [A minor](https://www.edgepedia.org/a-minor) is the relative minor of [C major](https://www.edgepedia.org/c-major), and C major is the relative major of A minor.[1](https://www.taylorfrancis.com/chapters/mono/10.4324/9781003331155-22/parallel-minor-keys-trevor-de-clercq) • [2](https://www.open.edu/openlearn/history-the-arts/music/an-introduction-music-theory/content-section-5.10) Because the two keys share a diatonic pitch collection yet organize it around different tonal centers, they sound very different despite sharing a signature.[3](https://human.libretexts.org/Bookshelves/Music/Music_Theory/Music_Fundamentals_(Ewell_and_Schmidt-Jones)/03%3A_Minor_Scales_and_Keys/3.01%3A_Minor_Keys_and_Scales)
| Key fact | Detail |
|---|---|
| Definition | Major and minor keys with the same key signature but different tonic notes; C major and A minor are the canonical pair.[1](https://www.taylorfrancis.com/chapters/mono/10.4324/9781003331155-22/parallel-minor-keys-trevor-de-clercq) • [2](https://www.open.edu/openlearn/history-the-arts/music/an-introduction-music-theory/content-section-5.10) |
| Distance between tonics | The relative minor tonic lies three semitones (a minor third) below the relative major tonic: C–B, B–B♭, B♭–A.[2](https://www.open.edu/openlearn/history-the-arts/music/an-introduction-music-theory/content-section-5.10) • [3](https://human.libretexts.org/Bookshelves/Music/Music_Theory/Music_Fundamentals_(Ewell_and_Schmidt-Jones)/03%3A_Minor_Scales_and_Keys/3.01%3A_Minor_Keys_and_Scales) |
| Degree method | The major tonic is the third degree of its relative minor scale; the minor tonic is the sixth degree of its relative major scale.[4](https://www.fittonmusic.com/writing/melody/modulation/relativekey.html) • [5](https://www.bbc.co.uk/bitesize/articles/zkwtvj6) |
| Signature difference | Zero: relative keys differ only in tonal center, not in any written accidental.[5](https://www.bbc.co.uk/bitesize/articles/zkwtvj6) |
| Closely related keys | Any major or minor key has five closely related keys, one of which is its relative major or minor.[6](https://human.libretexts.org/Bookshelves/Music/Music_Theory/Music_Theory_for_the_21st-Century_Classroom_(Hutchinson)/22%3A_Modulation/22.03%3A_Key_Relationships) |
| Modulation cost | Relative-key modulation requires no key-signature change but must establish a new tonic.[4](https://www.fittonmusic.com/writing/melody/modulation/relativekey.html) |
| German terminology | Relative key is *Paralleltonart* in German, *tonalità relativa* in Italian, *tonalité relative* in French, *tono relativo* in Spanish.[7](http://lilypond.org/doc/v2.27/Documentation/music-glossary/relative-key) |
## Definition and identification
The defining property is a shared key signature. Because the scales of C major and A minor have the same key signature, they are related, and each is called the other's relative.[2](https://www.open.edu/openlearn/history-the-arts/music/an-introduction-music-theory/content-section-5.10) The C major and natural A minor scales contain the same seven notes, C, D, E, F, G, A, and B, but are organized around C and A, respectively.[5](https://www.bbc.co.uk/bitesize/articles/zkwtvj6) Sharing a signature is not the same as sharing a key: the tonal centers differ, and a minor key and its relative major sound very different.[3](https://human.libretexts.org/Bookshelves/Music/Music_Theory/Music_Fundamentals_(Ewell_and_Schmidt-Jones)/03%3A_Minor_Scales_and_Keys/3.01%3A_Minor_Keys_and_Scales)
## How it works: finding and structuring the relationship
**The degree method.** The tonic of a major scale is always the third note of its relative minor scale, and the tonic of a minor scale is always the sixth note of its relative major scale.[4](https://www.fittonmusic.com/writing/melody/modulation/relativekey.html) In the C major scale, A is the sixth degree; in the A minor scale, C is the third degree.[5](https://www.bbc.co.uk/bitesize/articles/zkwtvj6) The method works because the minor scale pattern begins a half step plus a whole step lower than the major pattern, so the minor tonic always falls three half steps below the major tonic.[3](https://human.libretexts.org/Bookshelves/Music/Music_Theory/Music_Fundamentals_(Ewell_and_Schmidt-Jones)/03%3A_Minor_Scales_and_Keys/3.01%3A_Minor_Keys_and_Scales) Counted out from C, the descent runs C–B, B–B♭, B♭–A, three semitones in total; on a keyboard it is quicker to count downward from C to A than upward to the higher A.[2](https://www.open.edu/openlearn/history-the-arts/music/an-introduction-music-theory/content-section-5.10)
**Place among related keys.** Closely related keys differ from the starting key by a key signature of one sharp more or one flat more, and every major or minor key has five such close relatives, among them the home key's relative major or minor.[6](https://human.libretexts.org/Bookshelves/Music/Music_Theory/Music_Theory_for_the_21st-Century_Classroom_(Hutchinson)/22%3A_Modulation/22.03%3A_Key_Relationships) More broadly, every key has six related keys, and the seven notes of a diatonic circle of fifths, F–C–G–D–A–E–B, are shared by seven related keys.[4](https://www.fittonmusic.com/writing/melody/modulation/relativekey.html)
## Relative versus parallel key
The distinction is easy to mix up because both terms pair a major and a minor key. Relative keys share the same key signature but have different tonic notes, like A minor and C major; parallel keys share the same starting note, scale-degree 1, but have different key signatures.[1](https://www.taylorfrancis.com/chapters/mono/10.4324/9781003331155-22/parallel-minor-keys-trevor-de-clercq) C major and [C minor](https://www.edgepedia.org/c-minor) are parallel keys because both are felt around C, and they use different notes.[8](https://tadaoto.com/en/glossary/relative-parallel-key/) A mnemonic: *relative* keys are related by signature, *parallel* keys by tonic.
Terminology varies across languages. The LilyPond glossary gives German *Paralleltonart*, Italian *tonalità relativa*, French *tonalité relative*, Spanish *tono relativo*, Dutch *paralleltoonsoort*, Danish *paralleltoneart*, Swedish *parallelltonart*, and Finnish *rinnakkaissävellaji* for major and minor keys that have the same key signature.[7](http://lilypond.org/doc/v2.27/Documentation/music-glossary/relative-key)
The two relationships also behave differently in practice. Borrowing a few chords from the parallel key changes mood without losing the sense of key, whereas moving the tonal center to the relative or parallel key is heard as modulation.[8](https://tadaoto.com/en/glossary/relative-parallel-key/)
## By the numbers
- *Three semitones* separate the tonics of a relative pair, counted downward from major tonic to minor tonic.[2](https://www.open.edu/openlearn/history-the-arts/music/an-introduction-music-theory/content-section-5.10)
- A *shared diatonic pitch collection* and *zero signature difference* define the relationship; the two keys differ in which note functions as tonic.[5](https://www.bbc.co.uk/bitesize/articles/zkwtvj6)
- *Five closely related keys* exist for any major or minor key, one of them the relative.[6](https://human.libretexts.org/Bookshelves/Music/Music_Theory/Music_Theory_for_the_21st-Century_Classroom_(Hutchinson)/22%3A_Modulation/22.03%3A_Key_Relationships)
- *Six related keys* per key under the broader diatonic-circle counting, with seven modes sharing one signature.[4](https://www.fittonmusic.com/writing/melody/modulation/relativekey.html)
## Use in composition and modulation
Because relative keys share the same key signature and notes, it is common to modulate between them.[5](https://www.bbc.co.uk/bitesize/articles/zkwtvj6) Relative-key modulation is between keys that share the same diatonic pitch collection and key signature; it cannot be signaled by a key-signature change, but must establish a new tonic. The key signature remains unchanged, but the new tonic must be established.[4](https://www.fittonmusic.com/writing/melody/modulation/relativekey.html) In practice it can be difficult to distinguish relative-key modulation from normal melodic motion within a single key, so an unannotated melody can be heard either as modulation through the related modes or as motion within one key.[4](https://www.fittonmusic.com/writing/melody/modulation/relativekey.html)
Repertoire examples include [Leonard Cohen](https://www.edgepedia.org/leonard-cohen)'s "Hallelujah," which moves from C major to the relative minor A minor, and [Justin Timberlake](https://www.edgepedia.org/justin-timberlake)'s "Mirrors," which uses C minor for the verse, modulates to the relative major E♭ major for the chorus, and returns to C minor.[5](https://www.bbc.co.uk/bitesize/articles/zkwtvj6) In earlier periods, the Baroque and Classical, a composer beginning a piece in a major key would usually modulate to the dominant, while one beginning in a minor key would usually go to its relative major; composers of the Romantic era instead shifted to more distant key areas.[6](https://human.libretexts.org/Bookshelves/Music/Music_Theory/Music_Theory_for_the_21st-Century_Classroom_(Hutchinson)/22%3A_Modulation/22.03%3A_Key_Relationships)
## Minor-key complications and extension to modes
The shared-pitch picture is exact only for the natural minor. The harmonic minor raises the seventh degree by a half step, ascending and descending, to strengthen the tonal center, and, in its conventional form, the melodic minor raises both the sixth and seventh degrees by a half step when ascending.[3](https://human.libretexts.org/Bookshelves/Music/Music_Theory/Music_Fundamentals_(Ewell_and_Schmidt-Jones)/03%3A_Minor_Scales_and_Keys/3.01%3A_Minor_Keys_and_Scales) • [5](https://www.bbc.co.uk/bitesize/articles/zkwtvj6) From the natural pattern T S T T S T T the three forms of a minor scale, for instance [E minor](https://www.edgepedia.org/e-minor), can be generated.[2](https://www.open.edu/openlearn/history-the-arts/music/an-introduction-music-theory/content-section-5.10)
The relationship generalizes beyond major and minor. The seven diatonic modes built on one collection of notes all share the same key signature: Aeolian on A runs A, B, C, D, E, F, G, and Dorian on D runs D, E, F, G, A, B, C, both matching the C major collection.[5](https://www.bbc.co.uk/bitesize/articles/zkwtvj6) In jazz theory the [Dorian mode](https://www.edgepedia.org/dorian-mode), sometimes called "dorian minor," has its relative major a whole step lower, so D Dorian shares the key signature of C major, and the mode is used for improvising over ii chords.[3](https://human.libretexts.org/Bookshelves/Music/Music_Theory/Music_Fundamentals_(Ewell_and_Schmidt-Jones)/03%3A_Minor_Scales_and_Keys/3.01%3A_Minor_Keys_and_Scales) Under this broader view, all seven related modes are relative keys of one another.[4](https://www.fittonmusic.com/writing/melody/modulation/relativekey.html)
## References
1. [Trevor de Clercq, "Parallel Minor Keys," Routledge/Taylor & Francis](https://www.taylorfrancis.com/chapters/mono/10.4324/9781003331155-22/parallel-minor-keys-trevor-de-clercq)
2. ["5.10 Relative minor and relative major," An Introduction to Music Theory, The Open University](https://www.open.edu/openlearn/history-the-arts/music/an-introduction-music-theory/content-section-5.10)
3. ["3.1 Minor Keys and Scales," Music Fundamentals (Ewell and Schmidt-Jones), LibreTexts](https://human.libretexts.org/Bookshelves/Music/Music_Theory/Music_Fundamentals_(Ewell_and_Schmidt-Jones)/03%3A_Minor_Scales_and_Keys/3.01%3A_Minor_Keys_and_Scales)
4. ["Relative key," fittonmusic](https://www.fittonmusic.com/writing/melody/modulation/relativekey.html)
5. ["Melody and harmony: keys, scales, modes and ornaments," BBC Bitesize](https://www.bbc.co.uk/bitesize/articles/zkwtvj6)
6. ["22.3 Key Relationships," Music Theory for the 21st-Century Classroom (Hutchinson), LibreTexts](https://human.libretexts.org/Bookshelves/Music/Music_Theory/Music_Theory_for_the_21st-Century_Classroom_(Hutchinson)/22%3A_Modulation/22.03%3A_Key_Relationships)
7. ["Relative key," LilyPond Music Glossary](http://lilypond.org/doc/v2.27/Documentation/music-glossary/relative-key)
8. ["Relative Key / Parallel Key," tadaoto glossary](https://tadaoto.com/en/glossary/relative-parallel-key/)
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*Topic: Encyclopedia › Arts and culture › Music › Musical practice and theory › Instruments, theory, and world traditions › Pitch, tuning, scales, and musical acoustics*
*Initially written Sep 17, 2026 · Reviewed: Oct 25, 2026 · Edited: Oct 15, 2026; Oct 25, 2026 · Last review: Oct 25, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license