key

theorykeefrom English

The tonal center of a piece, defined by a scale and its tonic note.‍‍‍‌‍‌‍‍‍‌‍‌‌‍‌‌‌‌‌‌‍‌‌‍‌‌‍‍‍‍‌‌

In Depth

A key defines the tonal center of a piece — the note and scale that feel like home.‍‍‍‌‍‌‍‍‍‌‍‌‌‍‌‌‌‌‌‌‍‌‌‍‌‌‍‍‍‍‌‌ A piece in C major uses the C major scale as its foundation, with the note C providing the strongest sense of resolution and stability. Keys can be major (bright, stable) or minor (darker, more complex). The key signature at the beginning of a staff tells performers which notes are consistently sharped or flatted throughout the piece. Composers choose keys deliberately — trumpet-friendly keys like D major and B♭ major sound bright and festive, while flat keys like A♭ major and E♭ major are often associated with warmth and richness.

Did you know?

Before equal [temperament](/term/equal%20temperament), each key had a distinct character. Composers chose keys carefully — D major was considered brilliant and martial, while E-flat major was heroic and romantic.

Related Terms

scale modulation

More in Theory

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accidental

A sharp, flat, or natural sign that alters a note from the prevailing key signature.

accidentals explained

Symbols placed before notes to raise or lower their pitch by a semitone or return them to their natural state

acoustic

Relating to sound or the properties of sound, especially music produced without electronic amplification.

Aeolian mode

The natural minor scale, with the pattern W-H-W-W-H-W-W, producing the most common minor tonality in Western music.

aleatory

Music in which some element of the composition is left to chance or to the performer's discretion.

alto

The second-highest voice type, or an instrument pitched between soprano and tenor.

amplitude

The measure of a sound wave's intensity, perceived as loudness or volume.

anacrusis

One or more notes before the first full bar of a piece, also called a pickup or upbeat.

Keep Exploring

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