key signature

Key signatures with a double barline.
The key signatures of E-flat major and A major. Image © Brandy Kraemer

Definition of Key Signature:

A key signature is a pattern of accidentals (sharps or flats) at the very beginning of a staff, which represents a song’s key. The key signature comes between the clef and the time signature.
A key signature has either sharps or flats, never both. The number of accidentals in a key signature ranges from 0 to 7; C-sharp and C-flat major have seven sharps and flats, respectively, while C major has none.
See keynote.

 

Key Signature Accidental Patterns

The order of the accidentals written in a key signature is as follows (notice the pattern is simply reversed):

  • Sharps: F#  C#  G#  D#  A#  E#  B#
  • Flats: Bb Eb Ab Db Gb Cb Fb

To memorize the pattern of accidentals, try these mnemonic devices:
#’sFine china gets dirty after eating beets
b’sBread eaten at dinner gets children full

Continue Learning About Key Signatures:

 

 

Also Known As:

  • armatura (It)
  • armure (Fr)
  • Vorzeichen (Ger)

Pronunciation: kee'  ssig-nə-tchər

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Illustrated Piano Chords:

AbmajAbma7Abma9  | AbminAbm7Abm9  | AbdimAb°7  | AbaugAb+7  | Absus2Absus4