Understanding Time Signatures: 4/4, 3/4, 6/8 Explained

The two stacked numbers at the start of a piece are the time signature. They set the pulse of the music.

What the numbers mean

• The top number = how many beats are in each bar.
• The bottom number = which note value gets one beat (4 = quarter note, 8 = eighth note).

So 4/4 is four quarter-note beats per bar — by far the most common, which is why it's also called "common time." 3/4 is three quarter-note beats (think waltz: ONE-two-three). 2/4 is a brisk two-beat march.

Simple vs compound time

Here's the part that trips people up: 6/8 has the same total length as 3/4 (six eighth notes), but it feels completely different.

• 3/4 is simple time — three beats, each splitting into two: ONE-and-two-and-three-and.
• 6/8 is compound time — it's felt in two big beats, each splitting into three: ONE-two-three-FOUR-five-six. That lilting, rolling feel (think a jig, or "We Are the Champions") comes from the triple subdivision.

The rule: when the top number is 6, 9, or 12, you're usually in compound time — group the beats in threes.

Feel it with the metronome

Set the metronome and tap along, accenting beat one of each bar, until the pulse is in your body. Rhythm values themselves are covered in Reading Rhythm.