Rhythm is the backbone of every piece of music, and the time signature is what tells you how that rhythm is organized. In our previous guide we introduced what time signatures are. This one goes deeper: the difference between regular and irregular time signatures, how to recognize each, and how to find the time signature of any song you're listening to.
Rebeca Valverde
Time signatures fall into two main categories: regular and irregular. Regular signatures (like 4/4, 3/4, 6/8) divide each measure into equal groupings. Irregular signatures (like 5/8, 7/8, 11/8) don't.
🤓 Quick recap
Before going further, here's the foundation. The bottom number of a time signature represents the beat size (what note value gets one beat). The top number tells you how many of those beats are in each measure.
What is a regular time signature?
A regular time signature divides each measure into beats that can be grouped evenly into 2s, 3s, or 4s. The most common examples are 4/4, 3/4, 2/4, 6/8, 9/8, and 12/8. These are the time signatures you'll find in most pop, rock, classical, jazz, and dance music.
Regular time signature examples
4/4 = 4 quarter notes per measure
3/4 = 3 quarter notes per measure
6/8 = 6 eighth notes per measure
9/8 = 3 groups of 3 eighth notes per measure
Regular time signatures split into two subtypes: simple and compound.
Simple time signatures
In a simple time signature, each beat divides into two equal parts. The top number is divisible by 2, 3, or 4. If the top is divisible by 2 it's called binary (2/4, 2/2), if it's divisible by 3 it's ternary (3/4, 3/8), and if it's divisible by 4 it's quaternary (4/4, 4/2).
4/4 is by far the most common time signature in popular music. You'll find it in salsa, hip-hop, funk, electronic, pop, rock, country, and most film scores. If you don't know what time signature a song is in, your best first guess is 4/4.
Now let's compare 2/2 with 4/4:
2/2 = two half notes (4 quarter notes) per measure
4/4 = 4 quarter notes per measure
They look the same on paper, right? They do contain the same total note value, but 2/2 (also called cut time or alla breve) feels twice as fast because the pulse falls on the half note instead of the quarter. 2/2 is common in marches and faster classical pieces; 4/4 is the default for almost everything else.
Compound time signatures
In compound time, each beat divides into three equal parts instead of two. The most common compound signatures are 6/8, 9/8, and 12/8. 6/8 has two beats per measure (each beat = a dotted quarter, subdivided into three eighths). 9/8 has three beats. 12/8 has four.
You hear compound time in waltz-related dances, Irish jigs, gospel ballads, and slow blues. The lilting "long-short-short" feel is the giveaway.
3/4 vs 6/8: a common point of confusion. Both contain six eighth notes per measure, but 3/4 is simple time (three beats, each beat = a quarter, divided into two) while 6/8 is compound time (two beats, each beat = a dotted quarter, divided into three). The note total is identical, the feel completely different.
What is an irregular time signature?
An irregular time signature (also called asymmetric or odd meter) has a top number that can't be divided evenly into 2 or 3. The most common irregular signatures are 5/8, 7/8, 5/4, 7/4, and 11/8. Instead of repeating a single grouping, they alternate. A measure of 7/8, for example, is usually felt as 2+2+3 or 3+2+2 eighth notes.
Irregular time signatures are common in Balkan and Eastern European folk music, progressive rock (Pink Floyd's "Money" is in 7/4), jazz fusion, and twentieth-century classical (Stravinsky's Rite of Spring, Bartók, Bernstein). They give music a deliberately uneven push and pull.
Time signature: 7/8
Time signature: 13/8
Time signature: 5/8
How to find the time signature of a song
If you're trying to identify the time signature of a song by ear, follow these four steps:
- Tap to the pulse. Find the steady beat of the song and tap your foot or clap. That's your basic beat.
- Count to find where the pulse repeats. Listen for the strongest beat (usually beat 1 of each measure). Count "1, 2, 3, 4..." restarting at each strong beat. The number you reach before restarting is the top number of the time signature.
- Figure out the subdivision. Listen to how each beat divides. If each beat splits into 2 equal parts, it's simple time. If each beat splits into 3 equal parts, it's compound. If beats group unevenly (2+2+3, 3+2+2, etc.), it's irregular.
- Combine the count and the subdivision. A song you counted to 4, with beats subdividing into 2, is 4/4. Counted to 3, subdivided into 2, is 3/4. Counted to 2, subdivided into 3 (long-short-short feel), is 6/8. Counted to 7 with an uneven feel, likely 7/8.
Most pop, rock, and dance songs you'll listen to are in 4/4. Waltzes are in 3/4. Ballads in a "compound" feel are often in 6/8 or 12/8. Anything that feels stutter-step or uneven is probably irregular.
The fastest way to internalize this is to practice. Pull up a few songs you know, tap along, and try to identify the time signature. Then open Flat and write a short piece in 4/4, 6/8, and 5/8 so you can feel the difference yourself.