Key Signatures

Key signatures can provide a clue as to what key a particular piece of music is written in. In music, the key identifies the tonal center or home base of a song. This tonal center is a note that the whole song revolves around.

Every note in the song wants to gravitate towards the home base note. For example, if a song is in the key of C, then every note in the song gravitates towards C. If a song is in the key of F, then every note would gravitate towards F.


12 Possible Keys in Music

Since there are 12 notes on the piano keyboard, therefore there are 12 possible keys that any particular song can be played in.

A song can be played so that any one of these twelve notes will be its tonal center or home base.

A,
A♯ /B♭,
B,
C,
C♯ / D♭,
D,
D♯ / E♭,
E,
F,
F♯ / G♭,
G,
G♯ / A♭

How to Tell What Key a Particular Song is in

There are several ways to tell what key a particular song is written in. Let’s take a look at three things that can help you determine the key of a song:

Key Signatures
What Melody Note a Song Ends On
What Chord a Song Ends On

Learn to Read Music (Softcover)

Key signatures tell you what sharps or flats will appear in a song. Key signatures appear directly after the clef signs. The number of sharps or flats in the key signature can give you a clue as to what key a song is in.

For example, if a song has no sharps or flats in the key signature, the song may be in the key of C. If a song has one sharp in the key signature, it may be in the key of G. If a song has one flat in the key signature, it may be in the key of F. Below is a chart of key signatures and what key it may correspond to.

How to Read Music: Fundamentals of Music Notation Made Easy

Circle of Fifths           

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