Interval recognition by ear: major, minor, perfect and tritone within an octave

1. What the interval question asks you to do

This hub cannot play audio. Every excerpt below is an ORIGINAL constructed example, written for practice and given in text using the hub convention: pitch as letter plus octave number (middle C = C4), durations by their Australian names, bar lines as |. Play or sing each example on an instrument to hear it.

The aural part of the written paper usually opens with a short interval-recognition question. On the 2024 and 2025 papers it was worth 3 marks: a melody is played in context, three intervals are bracketed on the printed stave, and you name each one. The syllabus limits aural intervals to major, minor, perfect and the tritone, within one octave, so the full answer set is small: minor 2nd, major 2nd, minor 3rd, major 3rd, perfect 4th, tritone, perfect 5th, minor 6th, major 6th, minor 7th, major 7th and perfect octave (some teachers include the unison).

Two things make the question harder than it looks. First, the intervals sit inside a real melody with accompaniment, rhythm and expression, not as two isolated piano notes. Second, the excerpt may be played only a set number of times, so you need a routine that gets an answer on the first hearing and confirms it on the next.

Each bracket earns 1 mark for the quality and the number together. "5th" alone is incomplete; "perfect 5th" is the answer. Write the full name in words, because abbreviations such as "M3" and "m3" are easy to misread when handwritten quickly.

Treat the item as a warm-up for your ears as well as a source of marks. Settling into the key of the excerpt here, by humming the tonic quietly, makes the later dictation questions feel less abrupt.

2. The twelve intervals and their semitone counts

An interval has a number (count the letter names from the lower note to the upper note inclusive) and a quality (major, minor, perfect, augmented or diminished). By ear you hear the size in semitones, so learn the conversion until it is automatic. The table uses C4 as the lower note.

3. Building your own reference anchors

Many students learn intervals by attaching each one to the opening of a familiar song. That works, but the anchor must be a tune you can recall instantly and that starts with the interval going in the right direction. Build your own list rather than borrowing one, and test it: if you have to sing ten seconds of a tune to find the interval, the anchor is too slow for the exam.

A second, more reliable method is scale-degree anchoring. Hear the lower note as "doh" (degree 1) and sing up the major scale until you reach the upper note. Count the degrees: reaching degree 5 means a 5th, reaching degree 3 means a 3rd. Then check quality: if the upper note sat a semitone below where the major scale would put it, the interval is minor (for 2nds, 3rds, 6ths and 7ths). This method never fails, it just needs speed, which comes from daily repetition.

A third method is chord anchoring. A major 3rd is the bottom of a major triad; a minor 3rd is the bottom of a minor triad; the perfect 5th is the root and top of either triad; the minor 7th is root to 7th of a dominant 7th. If you hear the interval and can "fill it in" as a chord, the chord tells you the answer.

Combine methods: use the quick anchor on the first hearing, confirm with scale degrees on the second, and only change an answer if the second method clearly contradicts the first.

Whatever method you use, check it against a keyboard or tuner during practice. An anchor that is consistently a semitone out (hearing every minor 6th as a major 6th, say) will cost you every time it appears, so test each one deliberately against measured intervals before trusting it in the exam.

4. Melodic, harmonic, ascending and descending

A melodic interval is two notes heard one after the other; a harmonic interval is two notes heard together. The exam question bracketed intervals inside a melody, so they are melodic. You still name the interval from the lower note to the higher note, whichever comes first in time.

Descending intervals catch out more students than ascending ones because most anchors are learned going up. Train descending intervals separately. A useful trick: when you hear a descending leap, sing it back and then reverse it in your head so it ascends. The name does not change; A4 falling to E4 is a perfect 4th, exactly as E4 rising to A4 is.

In context, the accompaniment helps. If the melody leaps from the tonic up to the dominant while the harmony stays on chord I, the interval is a perfect 5th. If the melody leaps from the 3rd of the chord down to the root, it is a 3rd, and the chord quality tells you whether major or minor. Notice where the bracketed notes fall in the bar and what the bass is doing: musical context is evidence, not noise.

Watch for passing notes between the two bracketed notes. The bracket marks only its two end notes; ignore anything printed between them, even if it is played, and measure first note to last note.

Register also changes how an interval feels. A major 3rd low in the bass can sound muddy and close to a 4th, while the same interval high in a flute part sounds bright and narrow. When you practise, hear each interval in at least three registers and on different timbres (voice, piano, strings, brass) so that colour does not mislead you on the day.

5. Worked example: an original four-bar melody

Original constructed excerpt. A solo flute plays a melody in D major, 4/4, moderate tempo, over sustained string chords. Bar 1: D4 crotchet, A4 crotchet, F#4 minim. Bar 2: G4 quaver, B4 quaver, E5 crotchet, D5 minim. Bar 3: C#5 crotchet, G4 crotchet, A4 crotchet, F#4 crotchet. Bar 4: D4 semibreve. Every bar adds to four crotchet beats.

Brackets: (a) bar 1, D4 to A4; (b) bar 2, B4 to E5; (c) bar 3, C#5 down to G4; (d) bar 2 to 3, D5 down to F#4 is not bracketed here but is good extra practice.

• (a) perfect 5th. D up to A is five letter names (D E F# G A) and 7 semitones. Aurally it is tonic to dominant over the tonic chord: the hollow, open sound.
• (b) perfect 4th. B up to E is four letter names (B C# D E) and 5 semitones.
• (c) tritone. Measure from the lower note, G4, up to C#5: four letter names, 6 semitones, technically an augmented 4th. In the aural list the syllabus term is "tritone". Notice how it resolves inward: G falls to F#, C# rises (in the next phrase) to D.
• Extra: F#4 up to D5 spans six letter names and 8 semitones, a minor 6th.

Mark allocation in the real style: 1 mark for each correctly named interval, quality and number both required.

Notice what made each answer easy to check: every interval was tied to the key (tonic, dominant, leading note) and every bar total was verified. Do the same in practice. Writing the scale degrees under a melody (1, 5, 3, 4, 6, 9...) turns interval naming into arithmetic you can trust.

6. The tritone, inversions and spelling checks

The tritone is six semitones, which is why it divides the octave exactly in half. On paper it appears as either an augmented 4th (C–F#) or a diminished 5th (C–Gb), depending on spelling. Aurally the two are identical, so the aural list simply says "tritone". In the theory section, by contrast, you must use the written spelling, and "augmented 4th" and "diminished 5th" are different answers.

Inversion is a fast way to check a wide interval. Invert an interval by moving the lower note up an octave: the numbers always add to 9, and major becomes minor, minor becomes major, perfect stays perfect. So a minor 6th inverts to a major 3rd (E4–C5 becomes C4–E4) and a perfect 4th inverts to a perfect 5th. If a big leap is hard to hear, sing the complement inside the octave and convert.

A final spelling check before you move on: count letter names inclusive (never semitones) for the number, then semitones for the quality. Doing both prevents the most common slip, calling a 4th a 3rd because the notes "sound close".

Spelling checks matter more when accidentals appear. F#4 up to C5 is a diminished 5th (six semitones) although the letters F and C usually make a perfect 5th; the sharp has squeezed it. Always count letters first, then adjust the quality for each accidental.

7. Practice routine and exam technique

Interval recognition rewards short, frequent practice far more than occasional long sessions. Ten minutes a day for a term will do more than two hours the night before.

• Week by week: start with the perfect intervals and the octave, then add major and minor 3rds, then 2nds and 6ths, then 7ths and the tritone. Add descending versions once ascending ones are reliable.
• In context: the examiners say every aural example is drawn from real music in context. Once isolated intervals are secure, practise naming leaps in melodies from your own repertoire, recordings and the designated works.
• Sing first: before answering, sing the two notes quietly or in your head. Pitch you can reproduce is pitch you can measure.
• In the exam: on the first hearing, write a provisional answer lightly beside each bracket. On the second, confirm with scale-degree counting. Only then write the final answer in full words.
• Use the stave: on the real paper the bracketed notes are printed, so you can see the contour. Use the visual cue (step, skip or leap; up or down) to rule out impossible answers before you decide.

Three marks is a small part of 151 raw marks, but it comes at the start of the paper and sets your confidence for the dictations. Spend no more than the playings allow, and move on.

If an answer will not come, eliminate. Is it a step or a leap? Does the upper note sound like a chord note of the accompaniment or a clash? Is it inside or larger than a 5th? Three yes-or-no questions reduce twelve possibilities to two or three, and a reasoned guess between those is far better than a blank.