If you’ve ever looked at a piece of sheet music, you’ve seen the two numbers stacked on top of each other at the very beginning — that’s the time signature. It tells you two essential things about how the music is organised in time.
What the Numbers Mean
The top number tells you how many beats are in each measure.
The bottom number tells you what type of note gets one beat. The most common values are:
- 4 = quarter note gets one beat
- 2 = half note gets one beat
- 8 = eighth note gets one beat
4/4 Time — The Most Common Time Signature
4/4 time means there are four quarter-note beats per measure. It’s by far the most common time signature in Western music — so common it’s sometimes called “common time.”
3/4 Time — The Waltz
3/4 time has three quarter-note beats per measure. This gives music a lilting, circular feel — it’s the time signature of the waltz.
6/8 Time — Compound Time
6/8 is a compound time signature: there are six eighth-note beats per measure, but they’re felt in groups of two, giving the music a flowing, two-in-a-bar feel.
Simple vs Compound Time
Simple time signatures (2/4, 3/4, 4/4) divide the beat into two equal parts. Compound time signatures (6/8, 9/8, 12/8) divide the beat into three equal parts, giving them a characteristic “triplet” feel.