The note tree · From Zero to Mozart

Every note value is the one above it, cut in half. That one rule builds the entire system of durations — no exceptions, no extra rules to learn.

a whole note splits into two half notes
a half note splits into two quarter notes
a quarter note splits into two eighth notes
an eighth note splits into two sixteenth notes

So one whole note lasts exactly as long as two halves, or four quarters, or eight eighths, or sixteen sixteenths. The same span of time, divided finer and finer.

Every value is the one above it, cut in two. One whole note fills the same span of time as two halves, four quarters, eight eighths or sixteen sixteenths — the pulse underneath never changes, the notes just divide it finer. Rests follow the exact same tree, with no pitch.

Look at the tree above: every row is the same width, because every row is the same four beats. The top row spends all four on one note; the bottom row spreads them across sixteen. Reading down the rows, each note is half as wide — half as long — as the one above it.

Hear the halving

72 bpm

One whole note, then two halves, then four quarters, then eight eighths — each bar exactly four beats. Press play: the pulse never changes speed. Only the notes get shorter.

The values are building blocks

The tree isn't a staircase you have to climb in order — you mix the levels freely, in any combination that fills the bar. A quarter, then two eighths, then a half: 1 + 1 + 2 = 4.

66 bpm

Two bars, both adding to four beats, built from different-sized bricks. Add up the values in each bar and check they come to four.

A ratio, not a stopwatch

A quarter note is not "one second" or "about this fast." It's one beat — and a beat is however long the current tempo makes it. Speed the tempo up and every value shrinks together; the relationships never move. A half note is always exactly twice a quarter.

50 bpm

Four quarter notes. Play it at 50, then drag the tempo to 140. The notes are much shorter at 140 — but still four equal beats, still one quarter each. 'Quarter note' names a fraction of the beat, not a length of time.

A real tune is just the tree, arranged

Here's the rhythm of Mary Had a Little Lamb — no pitches, just the note values. Every one comes straight off the tree: a bar of four quarters, then three bars of quarter–quarter–half.

80 bpm

Clap and count the rhythm of Mary Had a Little Lamb: 'Ma-ry had a' (four quarters), then 'lit-tle LAMB', 'lit-tle LAMB', 'lit-tle LAMB' (quarter–quarter–half, three times). You'll play it with pitches in Movement I.

The usual mistake

Trying to memorise how fast each value "should" go — "a quarter note is roughly this speed." It has no fixed speed. Count the beat, and let every note be its fraction of that beat. When the tempo changes, you don't relearn anything; you just count faster or slower.

The other half of the mistake: letting the count go quiet inside a long note. A half note is still "1 – 2 –" in your head; a whole note is "1 – 2 – 3 – 4 –". The count runs the whole time.

Try

Clap one long note for four steady beats, counting aloud. Then the same four beats as four claps. Then as eight. Then sixteen. Keep your counting voice at the exact same speed the whole way through — only your hands speed up. That unchanging voice is the pulse.