Music intervals explained in one line: an interval is the distance in pitch between two notes. Every melody, chord and scale is built from intervals, so learning to name and hear them is one of the most useful skills in music. This beginner’s guide covers how intervals are named, the main ones to know, and how to recognize them by ear.
How intervals are named
Every interval has two parts: a number and a quality. The number counts the letter names from the lower note to the higher one, including both. From C to E covers C, D, E — three letters — so it’s a third. From C to G covers five letters, so it’s a fifth. Always count the starting note as 1.
The quality (major, minor, perfect, augmented, diminished) fine-tunes the exact distance. C to E is a major third; C to E♭ is a minor third. They’re both “thirds” by number, but the half-step difference changes the quality and the sound.
The half step and whole step
The smallest interval in Western music is the half step (one fret on a guitar, two adjacent piano keys), for example E to F. Two half steps make a whole step, like C to D. These two intervals are the building blocks of every scale, as shown in our guide to major vs minor scales.
The main intervals within an octave
Counting up from C, here are the common intervals and their half-step distances:
| Interval | Half steps | From C |
|---|---|---|
| Minor 2nd | 1 | C–D♭ |
| Major 2nd | 2 | C–D |
| Minor 3rd | 3 | C–E♭ |
| Major 3rd | 4 | C–E |
| Perfect 4th | 5 | C–F |
| Tritone | 6 | C–F# |
| Perfect 5th | 7 | C–G |
| Minor 6th | 8 | C–A♭ |
| Major 6th | 9 | C–A |
| Minor 7th | 10 | C–B♭ |
| Major 7th | 11 | C–B |
| Octave | 12 | C–C |
Notice the unison, 4th, 5th and octave are called “perfect” rather than major or minor — they have an especially stable, open sound. The major third and perfect fifth together form the triad at the heart of most chords.
How to recognize intervals by ear
The classic trick is to tie each interval to a familiar song. For example, a perfect fifth matches the opening of “Twinkle, Twinkle, Little Star,” and a perfect fourth matches the start of “Here Comes the Bride.” Pick one reference tune per interval and drill them daily. This is the core of ear training, which speeds up everything from transcribing songs to harmonizing on the fly.
Frequently asked questions
What’s the difference between a major and a minor interval?
A minor interval is one half step smaller than its major version. C to E is a major third (four half steps); C to E♭ is a minor third (three half steps). Seconds, thirds, sixths and sevenths come in major and minor; unisons, fourths, fifths and octaves are perfect.
What is a tritone?
A tritone is the interval of six half steps, like C to F#. It sits exactly halfway through the octave and has a tense, unstable sound, which is why it’s central to dominant seventh chords and a lot of dramatic music.
Do I need to read music to learn intervals?
No. You can learn intervals entirely by counting half steps and listening. Reading helps you see them on the staff, but plenty of self-taught musicians learn intervals purely by ear and by counting frets or keys.
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