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Modulation (music)

arts Maturity 7-9 Next article →

Music can travel through many different sounds. This movement is called modulation. It is the change from one tonality, or tonal center, to another.

Key change example
Key change example

Modulation helps create the structure of a musical piece. It also adds interest to the songs people play. Sometimes, a musician might only use a new key for a short time. This quick change is called tonicization.

Modulation vocal music example duple labelled
Modulation vocal music example duple labelled

One way to change keys is through common-chord modulation. This happens when two keys share a chord.

Common-chord modulation in Tchaikovsky, Mazurka Op. 39, No. 10
Common-chord modulation in Tchaikovsky, Mazurka Op. 39, No. 10

Using a shared chord makes the transition feel very smooth. For example, G major and D major share four different chords. These include G major, B minor, D major, and E minor. Musicians often use the most common chords to bridge the gap. This method is seen in the works of Mozart and Chopin.

Chopin - Prelude in C minor opening modulation
Chopin - Prelude in C minor opening modulation

Another method uses just a single note as a bridge. This is called common-tone modulation.

Schubert - Op.163 (D.956), i common-tone modulation
Schubert - Op.163 (D.956), i common-tone modulation

A musician might hold one note while the rest of the music shifts. For instance, a held F note can bridge B major to F major. This technique appears in the Unfinished Symphony by Schubert.

Common tone modulation between chromatic mediants in Mozart K 475
Common tone modulation between chromatic mediants in Mozart K 475

It is a very convenient way to move between different keys. It can even connect keys that are quite far apart.

Some changes are more surprising and use a trick called enharmonic modulation. This happens when a chord is spelled in a new way.

Schubert - op.9 D.365, mm.17-24 German sixth modulation
Schubert - op.9 D.365, mm.17-24 German sixth modulation

By changing how the notes are named, a musician can reach a new key. This can happen even if the new key is a half-step away. This type of modulation was very common in Romantic music. This is because Romantic music used many chromatic notes.

Schubert - op. 29, D.804, I, mm.144-49 enharmonic modulation
Schubert - op. 29, D.804, I, mm.144-49 enharmonic modulation

It allows for a huge range of musical options.

Finally, there is chromatic modulation. This occurs when notes change by just a small step.

Chromatic modulation in Bach BWV 300, m. 5-6
Chromatic modulation in Bach BWV 300, m. 5-6

These changes often happen between keys that are not closely related. A musician might use a special chord to lead the way. This can move the music up or down through small steps. This style can be found in the music of J. S. Bach.

Sequential modulation in Beethoven, Sonata Op. 53, movement I
Sequential modulation in Beethoven, Sonata Op. 53, movement I

It shows how many ways there are to explore sound.

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🖼️ Images & Media (16)
File:Modulation vocal music example duple labelled.png
Modulation vocal music example duple labelled.png
File:Key change example.png
Key change example.png
File:Chopin - Prelude in C minor opening modulation.png
Chopin - Prelude in C minor opening modulation.png
File:Common-chord modulation in Tchaikovsky, Mazurka Op. 39, No. 10.png
Common-chord modulation in Tchaikovsky,...
File:Common chord modulation in Mozart, Sonata in D Major, K. 284, III, m. 1-8.png
Common chord modulation in Mozart, Sonata...
File:Schubert - op.9 D.365, mm.17-24 German sixth modulation.png
Schubert - op.9 D.365, mm.17-24 German...
File:Schubert - op. 29, D.804, I, mm.144-49 enharmonic modulation.png
Schubert - op. 29, D.804, I, mm.144-49...
File:Schubert - Op.163 (D.956), i common-tone modulation.png
Schubert - Op.163 (D.956), i common-tone...
File:Common tone modulation between chromatic mediants in Mozart K 475.png
Common tone modulation between chromatic...
File:Chromatic modulation in Bach BWV 300, m. 5-6.png
Chromatic modulation in Bach BWV 300, m. 5-6.png
File:Mozart - K.331, III, mm.6-10 phrase modulation.png
Mozart - K.331, III, mm.6-10 phrase modulation.png
File:Sequential modulation in Beethoven, Sonata Op. 53, movement I.png
Sequential modulation in Beethoven,...

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