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The problem it solves
You need to know how the beats are grouped and where the strong accent falls, because music isn't a flat row of beats but cycles with one strong pulse and others weak.
Detailed theory
Key idea
The top number says how many beats each measure has; the bottom, which figure equals one beat.
The first beat of each measure is the strong one (the accent); it marks the start of the cycle.
Understand it
Beats aren't all felt the same: the mind groups them into cycles with a regular accent. The time signature is that grouping, marked at the start of the staff with two numbers.
The top number (the numerator) says how many beats there are per measure: 2, 3 or 4. The bottom one (the denominator) says which figure equals one beat: 4 means the quarter note gets the beat. So 3/4 is three quarter notes per measure.
In simple time, each beat divides naturally into two equal parts. The most common are 2/4 (march), 3/4 (waltz) and 4/4 (the most common of all).
Bar lines separate each cycle. Right after each bar comes the strong beat, the first of the measure; the others are weaker. This strong-weak pattern is what lets you feel where each measure starts.
It's like counting dance steps: 'ONE-two, ONE-two' is a 2/4; 'ONE-two-three' is a 3/4 (the waltz). The strong beat always lands on the ONE, and that organises the whole movement.
Figures and pulse
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In 4/4, the first beat is the strong one. The top number (4) is the beats; the bottom (4) says the quarter note equals one beat.
How to recognise it
How it's written
Look at the two numbers at the start: the top is the beats per measure, the bottom the figure that equals one beat (4 = quarter note). The vertical bar lines separate the measures and the beat right after is the strong one.
How it feels
Listen to a piece and find the beat that feels strongest and returns regularly: that's the first beat. Count from it (1-2-3-4 or 1-2-3) until the accent comes back.
Common mistake
Confusing numerator and denominator: the top is the beats, the bottom the figure of the beat.
Putting the accent on a beat that isn't the first: in simple time the strong pulse falls, by default, on the first beat.
Try it
Count 1-2-3, 1-2-3 tapping the 1 louder: you're feeling a 3/4 (a waltz).
C the same with 1-2-3-4 accenting the 1: that's a 4/4, the most common time signature.
On the instrument
Figures and pulse
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A 3/4 measure: three beats per measure with the accent on the first (the strong beat). It's the waltz time: ONE-two-three.
Where it's used
- Knowing where the accent falls
- Recognising the strong beat to play and phrase with meaning.
- Counting and coming in on time
- Knowing how many beats the measure has to count your entrance and not get lost.
Examples
Figures and pulse
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A 2/4 measure: two beats, like a march (ONE-two, ONE-two).
Figures and pulse
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A 4/4 with a bit of movement: the accent of the first beat organises the whole measure.
Exercises
Feel the accent — basic
Recognise the grouping of three beats in 3/4 with quarter notes only: one quarter note per beat of the cycle.
Complete 5 attempts · 70% accuracy to pass
Feel the accent — intermediate
Recognise the grouping of beats and the strong first beat in 3/4, now mixing quarter and half notes.
Complete 8 attempts · 70% accuracy to pass
Feel the accent — advanced
Keep the accent on the first beat in 3/4 with denser patterns that add eighth notes.
Complete 10 attempts · 70% accuracy to pass
Mini test
Check that you've got it.
0/6 answeredQuestion 1/6
What does a time signature do?