In this guide
A time signature describes the notated grouping and note values in a measure. In 4/4, count four quarter-note beats; in common 6/8, six eighth-note subdivisions are often felt as two dotted-quarter beats. Tempo is a separate choice.
A time signature is the pair of numbers near the beginning of a musical staff that indicates how rhythmic values are organized in a measure. In common simple meters, the upper number gives the number of beats per measure and the lower number identifies the note value used for each beat. In compound meter, the upper number commonly counts divisions of the beat instead.
For example, 4/4 has four quarter-note beats per measure. Common 6/8 contains six eighth-note divisions, usually grouped into two beats of three eighth notes each. The time signature describes grouping; it does not by itself say how fast to play.
How to read a time signature
| Signature | Measure contains | A common way to count |
|---|---|---|
| 4/4 | Four quarter-note beats. | 1 2 3 4, with the next measure beginning on the next 1. |
| 3/4 | Three quarter-note beats. | 1 2 3, then begin again. |
| 2/4 | Two quarter-note beats. | 1 2, then begin again. |
| 6/8 | Six eighth-note divisions, commonly grouped into two dotted-quarter beats. | 1 2 3 4 5 6, feeling the two groups of three; or count two larger beats. |
In these examples, the lower 4 refers to a quarter note and the lower 8 to an eighth note. The total duration in a measure can be filled by many combinations of notes and rests, not only notes of the named value. Open Music Theory's simple-meter guide explains beat units, measures and bar lines.
How to count 4/4 and 3/4
In 4/4, tap four steady quarter-note pulses and count “1, 2, 3, 4.” The next 1 starts the next measure. A note can last for several counts, and several shorter notes can fit within one count. Counting the pulse does not mean a new sound must occur on every beat.
In 3/4, count three quarter-note beats per measure: “1, 2, 3.” A waltz is a familiar example of triple meter, but the time signature alone does not determine the style or exact tempo. Listen for the grouping in the particular performance.
How is 6/8 different from 3/4?
Both measures can contain the same total duration as six eighth notes, but their usual beat grouping differs. In simple 3/4, three quarter-note beats each divide into two eighth notes. In common compound 6/8, two dotted-quarter beats each divide into three eighth notes. Counting all six eighth-note divisions can help a beginner hear the grouping: 1 2 3 | 4 5 6.
The Open Music Theory compound-meter guide explains why the dotted quarter is a common beat in 6/8. Actual accent and phrasing depend on the music; not every performance makes the grouping equally obvious.
Time signature vs. tempo
A time signature concerns the organization of beats or divisions within a measure. Tempo concerns the pace of a chosen pulse. In 4/4 at quarter note = 120 BPM, each quarter-note beat is nominally half a second and a four-beat measure lasts about two seconds. At quarter note = 60 BPM, the same measure lasts about four seconds.
Always identify the beat unit when comparing BPM. In common 6/8, if the two dotted-quarter beats are at 80 per minute, the eighth-note divisions occur at 240 per minute. A click on each division therefore needs a different numerical setting from a click on each larger beat. See what tempo means for more on BPM and pulse.
Practice a time signature with a metronome
- Choose the pulse. For 4/4, start with one click per quarter note. For 6/8, decide whether you need six eighth-note clicks or two dotted-quarter clicks per measure.
- Set a comfortable tempo. Open the metronome, enter a BPM from 30 to 300 and set a comfortable volume. Each click is one pulse at the number you choose.
- Choose an accent group. Use a group of four for four quarter-note clicks in 4/4, three for three in 3/4, or six for six eighth-note clicks in 6/8. For two dotted-quarter clicks in 6/8, use a group of two and subdivide each click into three equal parts.
- Count and play. Start the click, count several measures aloud, then add a short musical phrase. Listen for alignment and begin slowly enough to keep the count steady.
The metronome accents the first click in a chosen group; it does not independently identify a time signature or create a secondary accent on the fourth of six clicks. Browser scheduling and device latency can affect timing. For an existing recording, tap tempo measures your taps, not the song itself; compare the pulse and grouping by ear.
How to identify a time signature in a song
- Listen for a recurring pulse and tap it steadily. Try to hear where a repeated phrase or stronger beat begins.
- Count how many chosen pulses repeat before the grouping starts again. Compare groups of three and four, or two larger beats with three subdivisions each.
- Check several measures and listen for pickups, syncopation or a changing pattern. A prominent drum hit is not always the first beat.
- If you have a reliable score, compare its notated time signature and beat unit with what you hear. Without a score, more than one notation can describe the same recording.
A BPM estimate cannot determine meter on its own. The BPM guide explains how to choose a pulse and check a grid for drift.
Common questions
Is 6/8 always faster than 3/4?
No. Tempo and beat unit determine the pace. The signatures describe different common groupings, not a fixed speed.
Does 4/4 mean every bar has four notes?
No. The measure contains the equivalent duration of four quarter notes, which can be filled by different notes and rests.
Does a song have to keep one time signature?
No. Music can change meter, and a piece may use irregular groupings. Follow the score or listen to the passage rather than assuming every section matches.