5/9 5. Rhythm and Meter

Pulse, Beat, and Tempo

Rhythm is the organization of sounds and silences in time, while meter is the recurring pattern of strong and weak beats that helps listeners organize rhythm.

The pulse is the continuous flow of musical time. A beat is an individual perceived point within that flow; it can be tapped, conducted, or counted. The two ideas are closely related, but “pulse” emphasizes continuity and “beat” emphasizes an individual point.

Tempo describes how quickly the pulse moves. It is commonly expressed in beats per minute, or BPM:

• $\text{quarter note} = 60$ means $60$ quarter-note beats per minute, or one beat per second.

• $\text{quarter note} = 120$ means $120$ quarter-note beats per minute, or two beats per second.

Tempo words provide broader performance guidance: Largo suggests a very slow pace, Andante a moderate walking pace, Allegro a fast pace, and Presto a very fast pace.

A rhythm can change while the tempo remains constant. For example, four quarter notes and eight eighth notes can occupy the same two beats when the underlying pulse does not change.

Takeaway: Establish a steady pulse and tempo first, then fit the written rhythm into that temporal framework.

Meter and Time Signatures

A time signature appears after the clef and indicates how beats are organized. A measure, also called a bar, is a recurring group of beats, and bar lines separate measures.

In simple meters, the upper number generally indicates the number of beats per measure, while the lower number identifies the note value receiving the beat. Thus, $\frac{3}{4}$ normally contains three quarter-note beats per measure.

The most important distinction is how each main beat divides:

• Simple meter divides each main beat into two equal parts.

• Compound meter divides each main beat into three equal parts.

Simple meters can be classified by the number of main beats:

• Simple duple has two beats per measure, as in $\frac{2}{4}$.

• Simple triple has three beats per measure, as in $\frac{3}{4}$.

• Simple quadruple has four beats per measure, as in $\frac{4}{4}$.

Compound meters use the same duple, triple, and quadruple categories, but their upper number usually counts subdivisions rather than main beats:

• Compound duple: $\frac{6}{8}$, with two main beats, each divided into three.

• Compound triple: $\frac{9}{8}$, with three main beats, each divided into three.

• Compound quadruple: $\frac{12}{8}$, with four main beats, each divided into three.

A subdivision is a smaller, equal unit created by dividing a beat. In simple meter, the normal subdivision is binary; in compound meter, it is ternary.

Takeaway: Identify both the number of main beats and the way each beat divides; the upper number alone does not always give the number of main beats.

Beat Grouping and Notation

Notation should make the meter visible. A beam connects eighth notes, sixteenth notes, and other short notes. Notes should be grouped according to the underlying beat, not merely according to how many notes fit in the measure.

In $\frac{4}{4}$, notes are commonly grouped to show four quarter-note beats, often as two groups of two beats. In $\frac{3}{4}$, beams usually clarify three individual beats. In $\frac{6}{8}$, beams usually show two groups of three eighth notes because the meter has two main beats.

Rests should communicate the same structure. In $\frac{4}{4}$, a whole-measure rest may represent the entire measure, but shorter rests should normally be placed so that the beat structure remains clear.

A typical subdivision count in $\frac{4}{4}$ is:

$1\quad \&\quad 2\quad \&\quad 3\quad \&\quad 4\quad \&$

Beat 1 is usually strongest, beat 3 often has secondary strength, and beats 2 and 4 are weaker. In $\frac{3}{4}$, beat 1 is normally strongest, followed by weaker beats 2 and 3.

Takeaway: Clear beaming and rests reveal the meter and help performers maintain the correct beat grouping.

Simple and Compound Meter in Practice

In $\frac{3}{4}$, the usual organization is three main beats, each divided into two:

ONE-and TWO-and THREE-and

In $\frac{6}{8}$, the usual organization is two main beats, each divided into three:

ONE-la-li TWO-la-li

Although both measures contain six eighth-note subdivisions, their accent patterns differ. The main beats in $\frac{6}{8}$ are dotted quarter notes, whereas $\frac{3}{4}$ usually contains three quarter-note beats.

When performing compound meter, tap or conduct the main beats rather than every subdivision. Then keep the three smaller parts evenly spaced within each main beat.

This contrast can be summarized as follows:

• $\frac{3}{4}$: three main beats, each divided into two.

• $\frac{6}{8}$: two main beats, each divided into three.

Takeaway: Compare $\frac{3}{4}$ and $\frac{6}{8}$ by asking whether the music has three groups of two or two groups of three.

Syncopation and Displaced Accents

Syncopation shifts emphasis away from the expected metric accents. It may occur when a note begins on an offbeat, when a note continues across a stronger beat, when an expected strong beat contains a rest, or when a dynamic accent contradicts the normal metric emphasis.

In $\frac{4}{4}$, the expected hierarchy is approximately:

$1\qquad 2\qquad 3\qquad 4$

strong\quad weak\quad medium\quad weak

A note that begins on the “&” after beat 2 and continues onto beat 3 is syncopated because its attack begins on a weak part and crosses into a stronger beat. A rest on beat 1 followed by a note on the “&” of 1 is also syncopated because the expected strong beat is silent.

To perform syncopation accurately:

1. Keep tapping or counting the steady pulse.

2. Identify where each written note begins.

3. Sustain tied notes for their full written value.

4. Do not substitute the rhythm you expect to hear for the rhythm that is written.

A useful practice method is to clap the pulse while speaking the rhythm, then speak the pulse while clapping the syncopated pattern.

Takeaway: Preserve the steady meter internally even when the written attacks deliberately resist its expected accents.

Tuplets and a Reliable Counting Procedure

A tuplet temporarily changes the normal subdivision of a rhythmic span. The written number identifies how many equal attacks occur within that span, but the span must be determined first.

A triplet divides a beat that normally divides into two into three equal parts. In simple meter, three triplet eighth notes occupy the time normally taken by two regular eighth notes. They should be evenly spaced and are usually marked with the number $3$.

A duplet divides a beat that normally divides into three into two equal parts. In compound meter, two duplet eighth notes occupy the time normally taken by three regular eighth-note subdivisions. A duplet is usually marked with the number $2$.

Other tuplets include quintuplets, sextuplets, and septuplets. A written $5$, for example, may divide one beat, half a beat, or another duration depending on its notation.

To read an unfamiliar rhythm, use this sequence:

1. Identify the time signature and decide whether the meter is simple or compound.

2. Find the main beat.

3. Mark the beat groupings mentally or from the beaming.

4. Choose a counting system, such as $1\ \&\ 2\ \&$ in simple meter or $1\text{-la-li}\ 2\text{-la-li}$ in compound meter.

5. Check that all notes and rests fill the measure exactly.

6. Look for ties, dots, syncopation, displaced accents, and tuplets.

7. Practice slowly with a metronome, increasing the tempo only when the subdivisions are even and secure.

Takeaway: Determine the normal beat division first, then identify how the tuplet temporarily changes it.