6/8 vs 3/4: How to Tell Them Apart by Ear and on the Page
3/4 and 6/8 both fill a bar with six eighth notes, but they group them differently. 3/4 has three beats, each split into two eighths: ONE-and two-and three-and. 6/8 has two beats, each split into three eighths: ONE-two-three FOUR-five-six. By ear, 3/4 is a waltz you tap three times per bar, and 6/8 is a rocking, lilting two that you tap twice.
What do the numbers in 3/4 and 6/8 mean?
The top number says how many notes of one kind fill a bar, and the bottom number says which kind: 4 means quarter notes, 8 means eighth notes.
- 3/4 is three quarter notes per bar.
- 6/8 is six eighth notes per bar.
Since a quarter note is two eighths, both bars last the same total time. What differs is where the beats fall. In 3/4 the top number is also the number of beats. In 6/8 it is not: the six eighths are felt as two groups of three, so the bar has two beats, and each beat is a dotted quarter note, worth three eighths. The lesson on ties and dots explains why a dot makes a quarter note one and a half times as long.
Musicians call 3/4 simple triple time (three beats, each dividing in two) and 6/8 compound duple time (two beats, each dividing in three).
6/8 vs 3/4 at a glance
| 3/4 | 6/8 | |
|---|---|---|
| Beats per bar | 3 | 2 |
| One beat lasts | a quarter note | a dotted quarter note |
| Each beat splits into | 2 eighth notes | 3 eighth notes |
| Kind of meter | simple triple | compound duple |
| Counted aloud | 1 & 2 & 3 & | 1 2 3 4 5 6, or 1-la-li 2-la-li |
| Strong pulses on | 1, then 2 and 3 weaker | 1 and 4 |
| Six eighths beamed as | pairs (2+2+2), or all six together | two groups of three (3+3) |
| Feel | a waltz: ONE-two-three | a rocking two |
| Familiar examples | “Happy Birthday”, Strauss’s “The Blue Danube” | “Row, Row, Row Your Boat”, Irish jigs |
How do you tell 6/8 from 3/4 by ear?
- Tap your foot without thinking about it. Let it settle on whatever speed feels natural to the music.
- Count your taps between strong beats. If the music leans on every third tap, it is in three: 3/4. If it leans on every second tap, it is in two, and the question is what happens inside each tap.
- Listen inside one tap. If two even notes fit naturally into it, say “ONE-and”: that is a simple meter. If three fit, say “ONE-la-li”: that is compound, and two taps of three per bar is 6/8.
The quick test is the waltz. “Happy Birthday” sounds like ONE-two-three, ONE-two-three, and your foot wants three taps per bar. “Row, Row, Row Your Boat” sounds like a slow two, each step swinging through three smaller notes, and your foot wants two. Irish jigs are in 6/8, and their tum-ta tum-ta is the meter at its plainest. “House of the Rising Sun”, in the Animals’ version, is usually written in 6/8 too: count it and you hear two big pulses per bar, each made of three.
Why can the same music seem to be in either?
Because tempo changes what your foot picks. A slow 6/8 ballad can be felt in six, with a tap on every eighth note, and then it is easy to mistake for a meter in three. A fast waltz can be felt with one tap per bar. The written meter is the grouping, not the speed of your foot. If you are unsure, look for the accents: 6/8 always groups the six in 3+3, and 3/4 in 2+2+2. The article on tempo, rhythm and beat separates those three ideas, which is most of what this question needs.
How do you tell them apart on the page?
The time signature tells you directly. Beyond it, the notation itself is drawn to show the grouping:
- Beaming. In 6/8, eighth notes are beamed in threes, because each group of three is one beat. In 3/4 they are beamed in pairs, one pair per beat, or as a single group of six across the bar. Six eighths beamed 3+3 are never 3/4.
- The one-beat note. In 6/8 a single beat is often one dotted quarter note. In 3/4 a single beat is a plain quarter note, and a bar of three quarters is the typical waltz bar.
- The long-short figure. A quarter note followed by an eighth inside one beat, the “tum-ta tum-ta” of a jig, is a 6/8 pattern. It only fits in a beat that divides into three.
One bar can look the same in both: a dotted half note fills the whole bar in 3/4 and in 6/8 alike.
Can a song switch between 6/8 and 3/4?
Yes, and it is one of the oldest tricks in rhythm. Regrouping the same six eighth notes from two-times-three into three-times-two, or the reverse, is called hemiola. It was common in Baroque dances, often just before a cadence, and it survives in Latin American music. “America” from West Side Story is a well-known example: it alternates bars of 6/8 and 3/4, so the accents keep jumping between two pulses and three.
Common mistakes
- Reading 6/8 as six beats. At most tempos it is two beats. The six is the count of eighth notes, not of beats.
- Treating 6/8 as “3/4 doubled”. The bars hold the same amount of time, but the groupings, the accents and the feel are different.
- Beaming 6/8 in pairs. Beams show where the beat is. Pairs in 6/8 would draw three beats in a bar that has two.
Try it
The rhythm drills on this site are in 4/4 for now, so the 6/8 feel is best practised by tapping along with the songs above, two taps per bar. Before that, the rhythm basics lesson explains the beat, the bar and why beams group notes by beat, and Tap the rhythm trains the skill both meters depend on: keeping a steady pulse and placing even notes inside it.