What are time signatures?
Meter is how music organizes time. The score is divided into equal sections called measures (UK: bars), and every measure has the same number of beats and the same pattern of strong and weak beats. The time signature is written at the beginning of the score as a fraction: the top number (numerator) tells you how many beats there are in each measure, and the bottom number (denominator) tells you which note value is one beat.
The parts of a time signature
The time signature appears at the beginning of the score, next to the clef, as two stacked numbers:
- Top number (numerator): how many beats fit in each measure. If the top number is 3, the measure has three beats.
- Bottom number (denominator): which note value counts as one beat. 4 stands for the quarter note (UK: crotchet), 8 for the eighth note (UK: quaver) and 2 for the half note (UK: minim).
We explain it step by step, with examples, in beat unit and measure unit.
Simple and compound meter
There are dozens of time signatures, but in practice most music uses two main types:
Can you tell them apart by ear? Test yourself with the ear-training exercise recognize the meter by ear.
| Type of meter |
How each beat divides |
Traditional examples |
| Simple meter |
Each beat divides into 2 equal parts (duple subdivision) |
2/4, 3/4 (classic waltz), 4/4 (typical pop) |
| Compound meter |
Each beat divides into 3 equal parts (triple subdivision) |
6/8, 9/8, 12/8 |
This natural subdivision can be broken for a moment by a tuplet: a triplet puts three notes where two would fit (in simple meter), and a duplet puts two where three would fit (in compound meter).
To practice, there are time signature exercises: analyze the time signature, complete measures that are missing a note value, and recognize the meter from a written rhythm, with printable PDF worksheets.
Bar lines
Bar lines mark the limits of each measure on the staff (UK: stave). They are thin vertical lines that cross the staff from top to bottom. Each time a bar line appears, the previous measure ends and a new one begins.
Before the 16th century, sacred vocal music rarely used regular measures marked by bar lines. Singers followed the stress of the syllables in the Latin text to organize time.
Frequently Asked Questions
What is a measure in music?
A measure (UK: bar) is one of the equal sections that divide the music in time. The time signature, written at the start of the score as a fraction, tells you how many beats each measure has (top number) and which note value is one beat (bottom number).
What is the difference between simple and compound meter?
In simple meter each beat divides into two equal parts (duple subdivision), as in 2/4, 3/4 and 4/4. In compound meter each beat divides into three equal parts (triple subdivision), as in 6/8, 9/8 and 12/8.
What do the top and bottom numbers of a time signature mean?
The top number tells you how many beats fit in each measure. The bottom number tells you which note value is one beat: 4 stands for the quarter note, 8 for the eighth note and 2 for the half note. (In compound meters such as 6/8 the top number counts subdivisions, not beats.)
How do you find the strong beat of a measure?
The first beat of every measure is always strong. In 2/4 there is one strong and one weak beat. In 3/4 there is one strong and two weak beats (the waltz pattern). In 4/4 beat 1 is the strongest and beat 3 is medium-strong, while beats 2 and 4 are weak.
What is the difference between 6/8 and 3/4?
Both have six eighth notes per measure, but they are different. 3/4 is simple meter with 3 quarter-note beats (duple subdivision), while 6/8 is compound meter with 2 dotted-quarter-note beats (triple subdivision). 6/8 sounds like two groups of three eighth notes; 3/4 sounds like three groups of two.
More about time signatures
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Simple and Compound Meter
The big division: each beat splits in two (simple) or in three (compound). How to tell them apart.
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The 4/4 Time Signature
Common time: the most used meter in music, four quarter-note beats, with examples.
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The 3/4 Time Signature
The waltz meter: three quarter-note beats. How it differs from 6/8, with examples.
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The 2/4 Time Signature
Simple meter with two beats: the march and the polka, with examples on the staff.
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The 3/8 Time Signature
Simple or compound? The most common confusion with an 8 on the bottom, solved with examples.
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The 6/8 Time Signature
Compound meter with two beats: how to count it, with examples on the staff.
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The 9/8 Time Signature
Compound meter with three beats, the twin of 3/4, with examples on the staff.
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The 12/8 Time Signature
Compound meter with four beats: slow blues and ballads, with examples.
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The 6/4 Time Signature
Compound meter with two dotted-half-note beats, with examples on the staff.
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The 3/2 Time Signature
Simple meter with three half-note beats, typical of early music, with examples.
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Cut Time (¢)
Alla breve: counting in two what would be written in four. Compared with common time.
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Beat Unit and Measure Unit
Which note value fills the measure, what one beat is, and how to read the numbers.
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Analyzing Time Signatures
How to identify the type of meter and the value of its beats.
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Accents in Simple Meter
Strong and weak beats in meters with duple subdivision.
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Accents in Compound Meter
Where the accents fall in meters with triple subdivision.
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Syncopation
Moving the accent to a weak beat with a tie.
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Off-Beat Notes
A note that starts on a weak beat while the strong beat is silent.
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The Pickup (Anacrusis)
The lead-in notes before the first strong beat, and how the last measure is completed.
