How to recognize intervals by ear

An interval is the distance between two notes. Hear a melody and you’re hearing a chain of intervals; hear a chord and you’re hearing several at once. Naming them by ear is the skill underneath playing by ear, writing down a tune you’ve heard, and singing in tune with others.

It’s also a skill you can train. The method is simple: hear an interval, name it, check the answer, and come back to it on another day. This guide shows how to start, which intervals to learn first, and what to listen for. Every sound on the page is a real piano you can play, and there are two short drills to try.

What an interval is

Western music divides the octave into twelve equal steps called semitones (or half steps). An interval is named by how many semitones it spans: a minor third is 3, a perfect fifth is 7, an octave is 12. The name also carries a quality, such as major, minor or perfect, that you’ll learn to hear rather than calculate.

You’ll meet each interval in three forms:

• Rising: two notes one after the other, the second higher. This is how most melodies move.
• Falling: the second note lower. It’s the same interval, but it often sounds surprisingly different at first.
• Together: both notes at once, as in a chord. Musicians call this a harmonic interval, and the other two melodic.

Here is the perfect fifth in all three forms. Play them and listen for what stays the same.

Start with two that are far apart

A common mistake is trying to learn all twelve intervals at once. They blur together, and every answer becomes a guess. It works much better to start with two intervals that sound clearly different, learn to tell them apart without hesitating, and only then add a third.

A good first pair is the major third and the perfect fifth. Both are in every major chord, so you already know their sound even if you’ve never named it. The third spans 4 semitones and the fifth 7; the third sounds close and bright, the fifth wide and open.

Now try it. The drill below plays one of the two, rising, from a different note each time. Pick the one you heard. If you miss, press “Hear both” to compare them on the same note.

When you can do this without thinking, add the minor third and learn to tell it from the major third. Then add the perfect fourth. In Earstep each level adds one or two new intervals to the ones you know, so the set only ever grows by a little.

Listen for character, not distance

At first it’s tempting to count: hum up the scale from the lower note and count the steps. It works, but it’s slow, and it breaks down as soon as the notes go by quickly. The goal is to recognize each interval the way you recognize a voice, by its character, in one hearing.

Descriptions are personal, but these are the ones many musicians use:

• Octave (2:1): the same note, higher. The two notes blend so well that we give them the same letter name.
• Perfect fifth (3:2): open and stable, like a bare frame. It’s the sound of a violin’s open strings tuning up.
• Perfect fourth (4:3): open too, but less settled than the fifth, as if it wanted to move.
• Major third (5:4): bright and sweet; the bottom of a major chord.
• Minor third (6:5): darker, a little sad; the bottom of a minor chord.
• Minor second (16:15): two neighbors rubbing against each other. Tense.
• Tritone: exactly half an octave, 6 semitones. Restless; it seems to want to resolve somewhere.

Your own words matter more than these. When you notice what a sound feels like to you, write it down or say it aloud. That label is what you’ll reach for in the next drill.

Sing it. If you can sing the lower note and then the upper one, you’ve learned the interval in a way no description can give you.

Rising and falling are worth learning separately

A falling interval isn’t just a rising one played backward, at least not to the ear. A falling fifth can feel like coming home; a rising fifth like a fanfare. Many people find falling intervals harder at first, so learn the rising ones before you add falling ones, then intervals played together.

That’s also the order of the paths in Earstep: Rising intervals first, then Falling intervals and Intervals together, which unlock once you’ve passed the second rising level.

The twelve intervals at a glance

The ratio is how the two notes’ frequencies compare in just intonation: in a perfect fifth, the upper note vibrates three times for every two of the lower one. A piano’s equal temperament adjusts these ratios very slightly so every key works, but the ear still hears them as these intervals. Each ratio also draws a figure when two pendulums swing at it. Press any of them to hear it:

Two patterns make the table easier to remember. First, intervals come in pairs that add up to an octave: a fourth and a fifth, a major third and a minor sixth, a minor third and a major sixth. Turn one upside down and you get the other. Second, the tritone sits alone in the middle, the only interval that is its own inversion.

A few minutes a day beats an hour a week

Learning sticks better when practice is spread out over days than when it’s crammed into one sitting, an effect psychologists call the spacing effect. That’s why Earstep gives every sound its own schedule, in the spirit of the Leitner system for flashcards: name a sound right and it comes back after 1, 3, 7, 14 and 30 days; miss it and it comes back within 10 minutes, while it’s still fresh. A sound counts as learned once you’ve named it right on 3 separate days, so a lucky guess doesn’t count.

You can follow the same idea without an app. Practice the intervals you miss more often than the ones you know, keep sessions short, and come back tomorrow.

Try a bigger set

Here are four intervals at once: the two thirds, the fourth and the fifth. This is level 3 of Rising intervals in Earstep, and a good test of whether the first pairs have stuck.

If it went well, add the major second and the octave next. If it didn’t, go back to two intervals for a few days; there is no prize for rushing.

Sources

• Open Music Theory: Intervals: interval qualities and sizes in semitones.
• Interval (music), Wikipedia: melodic and harmonic intervals, inversion, and just ratios.
• Ear training, Wikipedia: what interval recognition is and how it’s usually practiced.
• Spacing effect, Wikipedia: why spaced practice beats cramming.
• Leitner system, Wikipedia: the flashcard schedule behind spaced practice.
• Octave, Wikipedia: notes an octave apart share a name.
• Violin, Wikipedia: the strings are tuned in fifths.