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The problem it solves
The same two notes show up sometimes in a row within a melodic line and other times stacked within a chord. You need to recognise that it is the same interval and to know what each way of presenting it contributes.
Detailed theory
Key idea
Melodic = the notes sound successively (one after the other); harmonic = they sound simultaneously (both at once).
The same notes always give the same interval name: only whether they are presented in time or stacked changes.
Understand it
An interval measures the distance between two notes. That distance does not change with how we play it: what changes is the way we present it in time. When the two notes sound one after the other, we speak of a melodic interval; when they sound exactly at the same time, of a harmonic interval.
The melodic interval is the one you find within a melody: it is a leap from one note to the next and it has direction, because it can ascend or descend. Hearing it trains the melodic ear, the one that follows the shape of a line and anticipates its movement.
The harmonic interval is the one you find within a chord: the two notes are heard blended at the same time. Here there is no direction, but fusion: it reveals how the two sounds combine, whether they merge smoothly or rub with tension. It is the realm of consonance and dissonance.
An analogy: it is like reading two words. If you say them one after the other, you hear their rhythm and order (melodic); if you write one above the other and read them at a glance, you see how they fit (harmonic). The words are the same; you have only changed how you present them in time.
That is why a fifth C–G is always a fifth: if you play C first and then G it is melodic, and if you play them together it is harmonic, but the name and the size do not change. Understanding this lets you connect the world of melody with that of chords.
Staff & keyboard
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The two notes of a fifth, C and G, on the staff and the keyboard. Whether you play them in a row or together, it is the same interval. Press each key to hear them.
How to recognise it
How it's written
On the staff, a melodic interval is written with the two notes separated in time, one after the other; a harmonic interval is written with the two notes aligned vertically, stacked on the same beat.
How it feels
If you can follow a leap up or down, you heard it melodically. If you hear a single block of sound where the two notes blend, you heard it harmonically. Try singing the two notes separately and then imagine them sounding together.
Common mistake
Thinking a melodic interval and its harmonic version are different intervals: they are the same interval presented in two ways.
Confusing direction (up or down) with type: direction only makes sense in the melodic one; the harmonic does not go up or down, it sounds at once.
Try it
Play C and then G (an ascending melodic fifth); then play the two together (a harmonic fifth) and confirm it is the same distance.
Repeat it with a third C–E: first in a row, then simultaneous, and notice how the feel changes without the name changing.
On the instrument
Interval distance
Melodic C–G: the two notes sound one after the other, like a leap within a melody. Play them to hear the ascending direction.
Interval distance
Harmonic C–G: the same two notes, but now sounding at once as in a chord. Same name and size; only the presentation in time changes.
Where it's used
- Reading melody and chord
- Recognising the same interval whether the notes leap in a melody or stack in a chord.
- Training two ears at once
- Melodic hearing follows the direction of the leap; harmonic hearing judges the blend and the consonance.
- Comparing the same distance
- Playing C–G in a row and then together to confirm the name does not change, only the presentation.
Examples
Interval distance
Melodic third C–E: first C, then E, like an ascending step within a line.
Interval distance
Harmonic third C–E: the same two notes sounding at once, like the base of a chord. The distance has not changed.
Exercises
Melodic intervals
Recognise intervals played one note after the other (melodic).
Complete 6 attempts · 70% accuracy to pass
Harmonic intervals
Recognise the same intervals played together (harmonic).
Complete 6 attempts · 70% accuracy to pass
Mini test
Check that you've got it.
0/10 answeredQuestion 1/10
What is a melodic interval?