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What is the rule for key signatures?

Key Signatures The clef and key signature appear at the beginning of every line of music. The key signature consists of one to seven sharps or flats. Key signatures are either all sharps or all flats, never mixed.

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MUSC 101 Music Fundamentals - Spring 2012

[Overview] [Syllabus]

Key Signatures

Key signatures appear on every line of music immediately to the right of the clef. The time signature appears on the very first line of music and not written again until it is changed. The clef and key signature appear at the beginning of every line of music. The key signature consists of one to seven sharps or flats. Key signatures are either all sharps or all flats, never mixed.

Key Signatures and Scales

Key signatures and scales are closely related. For every major (and relative minor) scale there is a corresponding key signature with exactly the same sharps and flats that appear in the scale. The melodies and chords used in most pieces are based on the notes of a specific major or minor scale and the key signature is used to specify those sharps and flats. The use of key signatures probably came about so that composers would not have to write sharps and flats so often. The sharps and flats that appear in the key signature affect every note of that name in the entire piece, no matter what octave the note appears in.

Here's a melody written without a key signature.

Here's the same melody in the key of E. It's much easier for the composer to write and for performer to read.

Number of Accidentals in Key Signatures

Key signatures use from zero to seven sharps or zero to seven flats. The number of sharps or flats in the key signature correspond precisely to the major or natural minor scale with the same number of sharps or flats in the scale.

Major Keys Using Sharps

The names of the major keys using sharps in the key signature follow the ascending circle of fifths: C G D A E B F# C#. As each new sharp is added to the scale, previously used sharps remain in effect. Key Number of Sharps Key Signature Scale C Major 0 G Major 1 D Major 2 A Major 3 E Major 4 B Major 5 F# Major 6 C# Major 7 As the number of sharps in a key signature increases, previously used sharps remain in effect. Major Key Minor Key Sharps 1 2 3 4 5 6 7 Key Signature C A 0 G E 1 F# D B 2 F# C# A F# 3 F# C# G# E C# 4 F# C# G# D# B G# 5 F# C# G# D# A# F# D# 6 F# C# G# D# A# E# C# A# 7 F# C# G# D# A# E# B#

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Major Keys Using Flats

The names of major keys using flats in the key signature follow the descending circle of fifths: C F Bb Eb Ab Db Gb Cb. As each new flat is added to the scale, previously used flats remain in effect. Key Number of Flats Key Signature Scale C Major 0 F Major 1 Bb Major 2 Eb Major 3 Ab Major 4 Db Major 5 Gb Major 6 Cb Major 7 As the number of flats in a key signature increases, previously used flats remain in effect.

Minor Keys Using Sharps

Minor keys use the key signature of the relative major key.

The names of minor keys using sharps in the key signature follow the ascending circle of fifths: a e b f# c# g# d# a#. Key Number of Sharps Key Signature Scale A minor 0 E minor 1 B minor 2 F# minor 3 C# minor 4 G# minor 5 D# minor 6 A# minor 7

Minor Keys Using Flats

The names of minor keys using flats in the key signature follow the ascending circle of fifths: a d g c f bb eb Ab. Key Number of Flats Key Signature Scale A minor 0 D minor 1 G minor 2 C minor 3 F minor 4 Bb minor 5 Eb minor 6 Ab minor 7

Major Sharp Keys Rules

The rules for determining major sharp keys are:

1. The key of C major has no sharps or flats.

2. For key signatures having one to seven sharps, the name of the major key is one half step (minor second) higher than the last sharp (the sharp furthest to the right) of the key signature.

Order of Sharps

The order that sharps appear in the key signature follow the clockwise (ascending) circle of fifths beginning with F sharp and continuing to B sharp. Sharps in a key signatures are always drawn on the following staff lines and spaces. Note the diagonal arrangement from top to bottom left to right. They never switch octaves.

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Major Flat Keys Rules

The rules for determining major flat keys are:

1. The key of C major has no sharps or flats.

2. The key of F major has one flat.

3. For key signatures having two to seven flats, the name of the major key is the name of the next to the last flat (the flat 2nd from the right) of the key signature.

Order of Flats

The order that flats appear in the key signature follow the descending circle of fifths beginning with B flat and continuing to F flat. Flats in a key signatures are always drawn in a specific order. Note the diagonal arrangement from top to bottom left to right.

Minor Key Rules

To find the name of the minor key signature, first determine the name of the major key signature and then count backwards three scale notes. Sharps and flats present in the key signature affect the key name.

Key Signatures and Scale Degrees

You can also remember key signatures by relating the last (right most) accidental of the key signature to scale degrees.

Sharps

Major - The last sharp is the leading tone of the key.

Minor - The last sharp is the supertonic of the key.

Flats

Major - The last flat is the subdominant of the key.

Minor - The last flat is the submediant of the key.

Relative Major/Minor

Relative keys are major and minor keys that have different names, but share the same key signature. For example, E minor is the relative minor of G major and A flat major is the relative major of F minor.

Parallel Major/Minor

Parallel keys are major and minor keys that have the same name, but use different key signatures. For example, B minor is the parallel minor of B major, and B major is the parallel major of B minor.

[Overview] [Syllabus]

Revised by John Ellinger, Spring 2012.

people.carleton.edu - 13-KeySignatures

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