A key signature is a group of sharps (#) or flats (♭) placed at the beginning of a staff, immediately after the clef sign.

The key signature tells us which notes are consistently sharp or flat throughout a piece of music.

Why Do We Use Key Signatures?

  • To avoid writing accidentals repeatedly.
  • To identify the key of a piece quickly.
  • To help musicians understand the tonal center of the music.

Examples

Key of C Major

  • No sharps
  • No flats

Key of G Major

  • One sharp (F#)

Key of F Major

  • One flat (B♭)

Important Terms

Sharp (#)
Raises a note by a semitone.

Flat (♭)
Lowers a note by a semitone.

Natural (♮)
Cancels a sharp or flat.

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