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Illustrated Tour of Sheet Music: Part One

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Time Signatures

Different time signatures.

Common time can be written as 4/4 or a C-shaped symbol.

Image © Brandy Kraemer

Understanding Time Signatures

Time signatures are written as fractions at the beginning of a staff. They regulate the rhythm of a song by organizing its beats in two ways:

  • The top number shows how many beats are in each measure.

  • The bottom number shows the length of the beats: A 4 means each beat is a quarter note long; a 2 indicates a half note, etc.
Therefore, a 4/4 time signature has four beats per measure, and each beat will be the length of a quarter note. A 3/4 time signature has three quarter-note beats per measure.

Common Time

4/4 time is also called common time because, you guessed it, it’s so common. You’ll see it a lot, so keep in mind:

  • It is written 4/4, or with a C-shaped symbol, representing a half-circle.

  • It’s also called quadruple meter.

Time signatures organize the beat, but the speed of the song depends on the tempo.

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