Piano and music theory / personal lessonsLesson 15 of 24

Three beats and compound time

Three quarter-note beats in 3/4

In 3/4, count 1, 2, 3, then begin a new bar. The quarter note remains the beat unit. A dotted half note lasts all three beats. Do not add a silent fourth beat out of habit. The first beat usually carries more metrical weight, but this is not an instruction to strike it loudly.

The left hand below plays one note on each beat. Say the counts while the right hand changes or holds. A bar line groups the beats; it is not a pause.

Three quarter-note beats

Right hand now: E4 · 1 beat · Right-hand finger 3

Stopped. Select a note with Next note, or play with sound.

Left hand now: C3 · finger 5

Right hand above; left hand below. Finger numbers: 1 thumb, 2 index, 3 middle, 4 ring, 5 little. Chord finger groups read from lowest note to highest. 3/4 · key C.

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Bars 1–2. Right: E4 G4 E4 | D4. Left: C3 E3 G3 | G2 B2 D3

Tempo: 60 quarter-note beats per minute. The count-in lasts 3 beats. Durations in the selected-note readout use quarter-note units. Tempo changes and Reset stop playback and select the first note. Audio starts only on request, plays once, and stops when hidden or off-screen. The tones are synthesized pitch guides, not a piano recording. A short release gap separates notes. Next note advances to the next attack in either hand. Held notes stay highlighted. There is no moving cursor. Start at low device volume.

Use the bass to locate all three beats

In the 3/4 score, read the two staves as simultaneous parts rather than finishing the upper staff before considering the lower one. Bar 1 begins with right-hand E4 and left-hand C3 together. Beat 2 pairs right-hand G4 with left-hand E3. Beat 3 pairs right-hand E4 with left-hand G3. The right-hand fingers are 3, 5, 3; the left-hand fingers are 5, 3, 1. Each vertical pairing belongs to one quarter-note beat, although the two parts move in different directions at different moments.

The right hand rises from E to G and returns to E. The left hand rises throughout C, E, G. Those are familiar C-major chord tones spread across the bar. They are not a simultaneous left-hand chord, and they are not three extra beats to insert between melody notes. If you play the right E, then the left C, you have separated an attack that should be together. A slow spoken count helps distinguish simultaneous notes from successive ones.

Bar 2 changes the relationship. The right hand plays D4 with finger 2 and holds it for the whole bar. The left continues G2, B2, D3 with fingers 5, 3, 1. On beat 1 both hands attack. On beats 2 and 3 only the left makes a new attack. The upper dotted half still occupies those beats. Silence between right-hand attacks does not mean the meter has stopped or that the bass must wait for another melody note.

Read through the join before playing it. Bar 1 beat 3 contains E4 above G3. The next numbered beat is bar 2 beat 1, D4 above G2. There is no fourth beat between these pairs. The bass must move to its lower starting point while the right hand moves down one step. Release and relocate the left hand rather than trying to preserve its old upper note. The score asks for a new position at the next beat, not a held span between the two Gs.

Six eighth notes can make two larger beats

In 6/8, the six eighth-note units group into two sets of three. Count “1-and-a, 2-and-a.” Each numbered beat is a dotted quarter. The beaming in the score shows the groups. This differs from three groups of two eighth notes in 3/4, even though both meters contain the duration of six eighth notes.

For this player's 6/8 examples, BPM counts dotted-quarter beats. At 60 BPM, a bar lasts two seconds and each eighth note lasts one third of a second. The 3/4 example at 60 quarter-note BPM lasts three seconds per bar. Equal BPM labels do not imply equal bar duration when the beat unit differs.

The count-in follows the chosen meter: three clicks in 3/4 and two dotted-quarter clicks in 6/8. The selected-note readout still measures duration in quarter-note units, so a dotted quarter appears as 1.5 there.

Two dotted-quarter beats

Right hand now: C4 · 0.5 quarter-note units · Right-hand finger 1

Stopped. Select a note with Next note, or play with sound.

Left hand now: C3 · finger 5

Right hand above; left hand below. Finger numbers: 1 thumb, 2 index, 3 middle, 4 ring, 5 little. Chord finger groups read from lowest note to highest. 6/8 · key C.

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Bars 1–2. Right: C4 D4 E4 G4 E4 D4 | C4 G4. Left: C3 G3 | C3 G3

Tempo: 60 dotted-quarter-note beats per minute. The count-in lasts 2 beats. Durations in the selected-note readout use quarter-note units. Tempo changes and Reset stop playback and select the first note. Audio starts only on request, plays once, and stops when hidden or off-screen. The tones are synthesized pitch guides, not a piano recording. A short release gap separates notes. Next note advances to the next attack in either hand. Held notes stay highlighted. There is no moving cursor. Start at low device volume.

Account for held notes without inventing attacks

The dotted half in the 3/4 melody combines a half note's two quarter beats with one more quarter beat. Count its duration as three beats beginning at the attack. At the next bar boundary its duration would be complete. You do not attack it again when you say 2 or 3. The count marks elapsed beat positions; it does not command a fresh press whenever a number is spoken.

A useful dry test uses the score without the instrument. Say the right-hand pitches of bar 1 on the three numbers. For bar 2, say D on 1 and continue counting 2 and 3 without saying D again. Meanwhile, tap a separate surface once on every number to represent the left hand. The spoken note and the tapping now have different attack patterns, but both remain inside the same three-beat bar. This preserves the coordination problem while removing key finding.

When you return to the instrument, keep the right D held as the left changes from G2 to B2 to D3. If both hands release after beat 1, the upper note has lost two beats. If the right repeats D on each bass note, its duration has changed into three quarters. Both errors can sound organized because the hands act together, but neither matches the notation. Watch the upper note's duration while reading the lower attacks rather than using hand simultaneity as your definition of correctness.

Manual Next note follows the next attack in either hand. In this second bar, a step can advance the bass while the held right D remains highlighted. That is a visual reminder of simultaneous time, not a request for the right hand to repeat. The synthesized reference includes a small release gap, so judge the written duration from the note value rather than trying to reproduce every detail of the electronic envelope. The browser does not assess whether your finger held D or whether a pedal prolonged it. No pedal is needed for this exercise.

Find the two groups inside six eighth notes

The 6/8 melody begins C4, D4, E4, G4, E4, D4, all eighth notes. Read the first three as the subdivisions of one main beat and the last three as the subdivisions of the next. Say 1-and-a for C, D, E, then 2-and-a for G, E, D. The fingers are 1, 2, 3, 5, 3, 2. The leap from E4 to G4 begins the second group; it does not add an extra subdivision between the two groups.

The left hand makes that grouping explicit. C3 begins with the first right-hand C and lasts a dotted quarter. G3 begins with the right-hand G and also lasts a dotted quarter. Each bass note spans three melody eighths. The left hand therefore changes on the numbered syllables, not on every spoken syllable. Read the beams in the upper part alongside those lower dotted quarters. Together they show the same division into two groups.

In bar 2, the right changes to dotted quarters too. C4 occupies the first group, and G4 occupies the second. The left plays C3 then G3 at the same attacks. The subdivision has not disappeared merely because fewer notes sound. Continue to feel three equal smaller units within each held note. If you lengthen the first bass note because the right has stopped moving, the second group arrives late and the bar becomes uneven.

Count the first bar on one repeated key before restoring its pitches. Keep the bass as two taps, one on each number. This isolates the difference between six melody attacks and two bass attacks. Then restore C, D, E under the first bass note and G, E, D under the second. If the second group starts before you have said the final a of the first, you have compressed a subdivision. If you pause after that a, you have inserted time between groups that the score does not contain. Neither problem requires changing the melody's fingering to investigate it.

Check the join between the two 6/8 bars as well. The last right-hand D4 belongs to the final a of beat 2. The next C4 begins on the following 1, together with the bass C3. Do not hold D for a whole main beat just because it is the final note in the group. Its eighth-note value matches the other five melody notes in that bar. Conversely, do not cut the first C4 of bar 2 into an eighth. Its dot belongs to a quarter note and asks it to fill the entire three-part first beat.

At the keyboard

  1. Clap three equal quarter beats and emphasize the first gently. Then clap two larger beats while saying three subdivisions inside each.
  2. Play the 3/4 example without adding a fourth beat at the bar line.
  3. In 6/8, clap the six eighth notes while keeping the two larger beats steady. Do not turn each group of three into a fast pair followed by a long note.
  4. Add the bass only after you can keep the grouping while the right hand holds a dotted quarter.

Compare the meters using one unchanged small unit

Three quarter notes and two dotted quarters each total six eighth-note units. That arithmetic explains why the meters can be confused, but it does not make their main beats identical. In 3/4, split each quarter beat into two eighths and say 1-and, 2-and, 3-and. In 6/8, split each dotted-quarter beat into three eighths and say 1-and-a, 2-and-a. Both counts have six syllables, but their numbered beats fall at different positions in the sequence.

Try six evenly spaced taps without changing their spacing. First speak the 3/4 count over them. The numbered syllables occur on taps one, three, and five. Then speak the 6/8 count. The numbered syllables occur on taps one and four. The small units remain equal in this controlled comparison; what changes is how you group them. A main beat need not be made louder to be recognized. You can show it through the count and the placement of an accompanying bass note.

Do not replace either displayed accompaniment with all six taps while claiming to play it unchanged. In the 3/4 score the left plays three quarter notes per bar. In the 6/8 score it plays two dotted quarters. The tapping comparison explains their relationship, but the written bass has fewer attacks than the subdivision grid. After the comparison, return to each score's actual note values and let the silent subdivisions continue inside the longer notes.

Six eighth notes in 3/4 need not always be beamed as three separate pairs in every piece. Engraving can reflect phrasing or a more complicated rhythm. Here the beaming and bass agree clearly with the meter, so they are useful reading evidence. Begin with the time signature and confirm the grouping through those visible parts. Counting every eighth as an equally important beat may help you locate notes initially, but it hides the two larger beats of this 6/8 exercise. Keep the numbered count available as you move from locating attacks to playing the whole phrase.

Read tempo as a duration of a named beat

The player's tempo label names the beat unit as well as its number. At 60 quarter-note beats per minute, one quarter beat lasts one second. The 3/4 bar therefore lasts three seconds. Its left-hand C, E, G begin one second apart. At 60 dotted-quarter beats per minute, a dotted quarter lasts one second. The 6/8 bar lasts two seconds, and the left-hand C and G begin one second apart. Equal BPM numbers do not give these two bars equal lengths.

The melody eighths in the 6/8 example each last one third of that one-second dotted-quarter beat. There are three equal subdivisions within it. An eighth in 3/4 at 60 quarter-note BPM would last half a second instead. To compare grouping while keeping eighth-note durations identical, you would need different numerical tempos for the two beat units. That is a reasoning comparison, not an instruction to find a custom tempo control. The page supplies its named presets rather than an arbitrary tempo entry field.

The selected-note readout uses quarter-note units internally. A dotted quarter therefore has a value of 1.5 there, even though it is one main beat in the 6/8 count. A dotted half has a value of 3 and fills a 3/4 bar. The readout has not changed the notation or contradicted the tempo label. It is measuring duration with a different unit. Always ask whether a number describes quarter-note lengths, main beats, or attacks before comparing it with another number.

Request audio only when you want the reference. The 3/4 count-in gives three quarter-beat clicks; the 6/8 count-in gives two dotted-quarter clicks. In 6/8, silently fit and-a between those clicks before the phrase begins. A click does not sound on every melody eighth. If you enter on the third imagined click, you have counted a bar the player never supplied. If bar 2 of the phrase seems empty, retain the two groups while both hands hold dotted quarters. The practical check is whether the next numbered beat arrives in its expected place, not how many times a hand moves during the bar.

Exercises and readiness checks

Fill a 3/4 bar

How long does the right-hand dotted half note last in the second 3/4 bar?

Hint

A dot adds half the original value.

Worked answer

Check the written music

Right hand above; left hand below. Finger numbers: 1 thumb, 2 index, 3 middle, 4 ring, 5 little. Chord finger groups read from lowest note to highest. 3/4 · key C.

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Finger numbers identify the hand’s planned route. Read the relevant passage alongside the worked answer; these are the same pitches and durations used by playback.

A half note is two quarter-note beats; its dot adds one more. Hold for beats 1, 2, and 3, then release or change on the next 1. A fourth beat would make the bar too long.

Identify the 6/8 beat

At 60 BPM in the 6/8 player, how long is one bar and how many main beats are in it?

Hint

The player labels its beat unit as dotted quarter.

Worked answer

Check the written music

Right hand above; left hand below. Finger numbers: 1 thumb, 2 index, 3 middle, 4 ring, 5 little. Chord finger groups read from lowest note to highest. 6/8 · key C.

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Finger numbers identify the hand’s planned route. Read the relevant passage alongside the worked answer; these are the same pitches and durations used by playback.

There are two main beats, each lasting one second, so the bar lasts two seconds. Each beat divides into three eighth notes. The time signature's top 6 counts eighth-note units, not six metronome clicks at this chosen beat level.

Compare the grouping

Why are 3/4 and 6/8 not interchangeable?

Hint

Compare three groups of two subdivisions with two groups of three.

Worked answer

Check the written music

Right hand above; left hand below. Finger numbers: 1 thumb, 2 index, 3 middle, 4 ring, 5 little. Chord finger groups read from lowest note to highest. 6/8 · key C.

12353251115512
Finger numbers identify the hand’s planned route. Read the relevant passage alongside the worked answer; these are the same pitches and durations used by playback.

Both can contain six eighth notes, but their main-beat grouping differs. In 3/4, three quarter beats each divide into two eighths. In 6/8, two dotted-quarter beats each divide into three eighths. The placement of emphasis, beaming, and accompaniment follows that grouping.

These studies were written for this course. Reference audio is synthesized, with no microphone input or automatic grading. The scores use locally generated VexFlow notation and remain available offline. Long scores have a printable view; no pedal is required to use the lesson.

References and scope

MusicTheory.net lessons provide further explanations of notation, rhythm, and chords. Open Music Theory is a longer reference. The keyboard diagrams, exercises, and rock-style study here were made for these lessons. The Beethoven example uses a public-domain melody, transposed to C, not a modern published arrangement.

Robert Hutchinson's Music Theory for the 21st-Century Classroom provides optional explanations of staff notation. Its sections on meter, major-scale construction, inversions, and chord symbols support the corresponding theory explanations. These references do not assess physical technique or certify a playing level.

Casio CT-S300 product information is the reference for the likely instrument. The lessons do not depend on a particular button sequence, USB connection, or automatic accompaniment.