Small intervals: half steps, whole steps and thirds
Count the four smallest distances between notes on a keyboard, 1, 2, 3 and 4 half steps, and learn what each one usually sounds like.
Half step and whole step
A half step is the smallest distance on the keyboard: from one key to the very next key, black or white. A whole step is two half steps. Count the moves, not the keys, and never count the key you start on. Two places on the white keys have no black key between: E–F and B–C. Those neighbours are only a half step apart.
C to C♯ is 1 half step. C to D is 2, a whole step. E to F is 1, even though both keys are white.
Check yourself
Leila plays B and then the C just above it, two white keys side by side. Her friend says, "White to white is always a whole step." What is the distance?
- A whole step, because every pair of neighbouring white keys is 2 apart
- A half step, because there is no black key between B and C
- Three half steps, because B, C and the key after make three
- It can't be counted without hearing it
Show the answer
A half step, because there is no black key between B and C
Right. B to C is one move with nothing in between, so it's a half step. E to F is the other place this happens.
How they usually sound
Half step · 1
So close the two notes almost lean on each other. One after the other, most people hear a slide or a sigh. Played together, they rub: a buzzy, crowded sound. Für Elise opens by rocking between E and D♯, a half step.
Whole step · 2
A clear, ordinary step, like walking up one stair. Played together it still rubs a little, but much less. Most scales are mostly whole steps, so this is the most common move in melodies.
"Ode to Joy", first notes, starting on E.
E E F G G F E D C
E -> E same
E -> F up 1 half step (no black key between)
F -> G up 2 whole step (F♯ is between)
G -> F down 2 whole step
F -> E down 1 half stepThe tune climbs E–F–G: a half step, then a whole step.
The two steps look alike on white keys but are different sizes.Sing it slowly and notice that E to F feels tighter than F to G.
Check yourself
In "Ode to Joy", Omid says E up to F and F up to G are the same size, because both are moves to the next white key.
Show the answer
False
False. E to F has no black key between, so it's 1 half step. F to G jumps over F♯, so it's 2, a whole step. The next white key is not a fixed distance; always check for a black key in the gap.
ONE HOP OVER
Two thirds: 3 and 4 half steps
Skip one letter and you get a third: C to E covers C, D, E, three letters. Thirds come in two sizes. A minor third is 3 half steps, like C to E♭. A major third is 4, like C to E. Most listeners hear the major third as bright and open, and the minor third as darker or softer. That one half step is the difference.
Play C with E, then C with E♭. Same C, and the top note moves by only a half step, yet many people describe the first as happy and the second as sad.
Worked example: count up from C
- Put your finger on C
This key is 0. You don't count it.
- C♯ is 1, D is 2
1 is a half step, 2 is a whole step.
- E♭ is 3
The black key after D. C to E♭ is a minor third.
- E is 4
The next white key. C to E is a major third.
- Do the same from any note
From A: A♯ 1, B 2, C 3, so A to C is a minor third. From F: F♯ 1, G 2, G♯ 3, A 4, so F to A is a major third.
Check yourself
Count the half steps going up. Minor third or major third?
- C up to E
- C up to E♭
- A up to C
- G up to B
- D up to F
- F up to A
Show the answer
Minor third · 3: C up to E♭, A up to C, D up to F
Major third · 4: C up to E, G up to B, F up to A
Check yourself
Arash is making a two-note ringtone that starts on C and goes up. He wants the second note to sound bright and open, not rubbing and not dark. Which note should he pick?
- C♯, one half step up
- E♭, three half steps up
- E, four half steps up
- D, two half steps up
Show the answer
E, four half steps up
Yes. C to E is a major third, and most people hear it as bright. C to E♭ would be the darker minor third, and C to C♯ would crowd the C.
What to listen for
- 1 half step: the notes lean on each other; together they rub.
- 2, a whole step: a plain, clear step to the next note.
- 3, minor third: a small hop that most people hear as darker.
- 4, major third: a small hop that most people hear as brighter.
Check yourself
Count up from the first note and match each pair to its interval
Show the answer
- E up to F → Half step (1)
- F up to G → Whole step (2)
- E up to G → Minor third (3)
- D up to F♯ → Major third (4)
Lesson recap
- Count moves from key to key, black keys included, and never count the starting key.
- Half step = 1, whole step = 2. E–F and B–C are half steps with no black key between.
- Minor third = 3 (C to E♭), major third = 4 (C to E).
- Most people hear a half step as close and rubbing, a major third as bright and a minor third as darker.
- Key colour tells you nothing: count, then check the sound.