Reading time: 10 minutes |
Sections 4.1, 4.2, and 4.3 of the ABRSM Grade 5 Music Theory exam test your knowledge of intervals – the distance between two notes.
The three question types are:
- 4.1: Given two notes, circle the interval between them
- 4.2: Given two notes, circle the quality of the interval (major, minor, perfect, etc.)
- 4.3: Given a bass note and an interval name, write the note above
Intervals can be one of the trickier topics in music theory because they build on your knowledge of key signatures and scales. But once you understand the system, it becomes consistent and logical.
Here’s everything you need to know.
What Is an Interval?
An interval is the distance between two notes.
Intervals are described by two things:
- Number – how many letter names apart (e.g., 2nd, 3rd, 4th)
- Quality – major, minor, perfect, augmented, or diminished
Intervals Within a Major Scale
Let’s use F major as an example.
| Notes | Interval Name |
|---|---|
| F – G | Major 2nd |
| F – A | Major 3rd |
| F – B♭ | Perfect 4th |
| F – C | Perfect 5th |
| F – D | Major 6th |
| F – E | Major 7th |
| F – F | Perfect 8ve (Octave) |
The Rules for Interval Qualities
| Interval Type | Always Called |
|---|---|
| 2nd, 3rd, 6th, 7th | Major |
| 4th, 5th, 8ve | Perfect |
Compound Intervals (Beyond the Octave)
When an interval is greater than an octave, we call it a compound interval.
| Simple Interval | Compound Name | Alternative Name |
|---|---|---|
| Major 2nd | Compound Major 2nd | Major 9th |
| Major 3rd | Compound Major 3rd | Major 10th |
| Perfect 4th | Compound Perfect 4th | Perfect 11th |
| Perfect 5th | Compound Perfect 5th | Perfect 12th |
| Major 6th | Compound Major 6th | Major 13th |
| Major 7th | Compound Major 7th | Major 14th |
| Perfect 8ve | Compound Perfect 8ve | Perfect 15th |
Quick Tip: To convert a compound interval to a simple interval, subtract 7.
- Major 9th – 7 = Major 2nd
- Perfect 12th – 7 = Perfect 5th
- Major 13th – 7 = Major 6th
Variants of Major Intervals
Major intervals can be altered to become minor, diminished, or augmented.
| Change | Result |
|---|---|
| Distance increases by 1 semitone | Augmented |
| Distance reduces by 1 semitone | Minor |
| Distance reduces by 2 semitones | Diminished |
Example: Major 3rd (D – F♯)
| Change | Result |
|---|---|
| D – F♯ | Major 3rd |
| D – F♮ | Minor 3rd (lowered by 1) |
| D – F♭ | Diminished 3rd (lowered by 2) |
| D – F𝄪 | Augmented 3rd (raised by 1) |
You can also achieve the same effect by changing the bottom note:
| Change | Result |
|---|---|
| D – F♯ | Major 3rd |
| D♯ – F♯ | Minor 3rd (raised bottom by 1) |
| D𝄪 – F♯ | Diminished 3rd (raised bottom by 2) |
| D♭ – F♯ | Augmented 3rd (lowered bottom by 1) |
Variants of Perfect Intervals
Perfect intervals follow a slightly different system – there is no minor version.
| Change | Result |
|---|---|
| Distance increases by 1 semitone | Augmented |
| Distance reduces by 1 semitone | Diminished |
Example: Perfect 5th (B♭ – F)
| Change | Result |
|---|---|
| B♭ – F | Perfect 5th |
| B♭ – F♭ | Diminished 5th (lowered by 1) |
| B♭ – F♯ | Augmented 5th (raised by 1) |
Again, you can achieve the same effect by changing the bottom note:
| Change | Result |
|---|---|
| B♭ – F | Perfect 5th |
| B♮ – F | Diminished 5th (raised bottom by 1) |
| B𝄫 – F | Augmented 5th (lowered bottom by 1) |
Summary of Interval Qualities
| Quality | Major Interval | Perfect Interval |
|---|---|---|
| Raised by 1 semitone | Augmented | Augmented |
| Normal | Major | Perfect |
| Lowered by 1 semitone | Minor | Diminished |
| Lowered by 2 semitones | Diminished | (N/A – no such thing) |
The Three-Step Method
To identify any interval, follow these three steps:
Step 1: Count the Letter Names
Determine the interval number by counting the letter names from the bottom note to the top note (inclusive).
Example: G to D♭
- G – A – B – C – D = 5th
Step 2: Check the Major Scale
If the top note belongs to the major scale of the bottom note, the interval is either major or perfect.
Example: G to D
- D is the 5th note of G major
- Perfect 5th = ✅
Step 3: Adjust If Needed
If the top note doesn’t belong to the major scale, work out how many semitones it has been raised or lowered.
Example: G to D♭
- Perfect 5th would be G – D
- D♭ is 1 semitone lower than D
- Therefore: Diminished 5th
Worked Example 1: 4.1 – Identify the Interval
The question: Identify the interval between G (bass) and D♭ (top).
Step 1: Count the letter names
G – A – B – C – D = 5th
Step 2: Check the major scale of G
G major scale: G – A – B – C – D – E – F♯
D is the 5th note – perfect 5th would be D♮.
Step 3: Adjust
We have D♭, which is 1 semitone lower than D♮.
Perfect 5th lowered by 1 semitone = Diminished 5th
Answer: Diminished 5th
Worked Example 2: 4.2 – Identify the Interval Quality
The question: Identify the interval between F♯ (bass) and E♭ (top).
Step 1: Count the letter names
F – G – A – B – C – D – E = 7th
Step 2: Check the major scale of F♯
F♯ major scale: F♯ – G♯ – A♯ – B – C♯ – D♯ – E♯
Major 7th would be E♯.
Step 3: Adjust
We have E♭.
- E♯ → E♮ (1 semitone down)
- E♮ → E♭ (2 semitones down)
Major 7th lowered by 2 semitones = Diminished 7th
Answer: Diminished 7th
Worked Example 3: 4.3 – Write the Note Above
The question: Write the note above C to form an augmented 12th.
Step 1: Convert to a simple interval
Augmented 12th – 7 = Augmented 5th
Step 2: Find the perfect 5th
C major scale: C – D – E – F – G – A – B
Perfect 5th above C = G
Step 3: Apply the quality
Augmented 5th = raise the top note by 1 semitone.
G → G♯
Step 4: Add the octave
Augmented 12th = G♯ at the higher octave.
Answer: G♯ (one octave above)
Quick Reference: Interval Qualities
| Quality | Symbol | When Used |
|---|---|---|
| Perfect | P | 4th, 5th, 8ve |
| Major | M | 2nd, 3rd, 6th, 7th |
| Minor | m | 2nd, 3rd, 6th, 7th (lowered by 1) |
| Augmented | A | Any interval (raised by 1) |
| Diminished | d | Any interval (lowered) |
Common Pitfalls to Avoid
- Counting the letter names incorrectly. Remember to count the starting note as 1.
- Forgetting the key signature. Always check the major scale of the bottom note.
- Confusing minor and diminished. Minor = lowered by 1 semitone; Diminished = lowered by 2 semitones (or 1 for perfect intervals).
- Miscalculating compound intervals. Use the “minus 7” method to convert to simple intervals.
How to Approach These Questions
| Step | Action |
|---|---|
| 1 | Count the letter names to find the interval number |
| 2 | Check the major scale of the bottom note |
| 3 | If the top note matches → major or perfect |
| 4 | If not → count semitones and apply the correct quality |
| 5 | For compound intervals, subtract 7 first |
Practice Makes Perfect
Understanding the theory is one thing, but exam success comes from repeated, focused practice. That’s why my interactive practice site (app.owenmusictheory.com) can make all the difference in your preparation.
Here’s how the two practice modes work:
Drill Mode: Master One Section at a Time
Drill Mode is designed for targeted practice. You get access to all the questions organised section by section, just like the real exam. This means you can:
- Focus specifically on intervals until it feels second nature
- Skip the sections you’re already confident in and spend your time where it matters most
- Practise the same question type repeatedly with virtually unlimited questions – you’ll never run out of fresh material
With instant feedback on every answer, you’ll learn from your mistakes immediately and reinforce correct answers right away.
Exam Mode: Simulate the Real Thing
When you’re ready to put it all together, Exam Mode gives you the full experience:
- Full-length papers in the exact format of the ABRSM exam
- Randomised questions each time you take a test – no two papers are the same
- A 2-hour time limit to help you build speed and stamina
- A final score and detailed feedback at the end, so you know exactly where you stand
This mode is invaluable for reducing exam-day anxiety. The more you practise under real conditions, the more confident you’ll feel when it counts.
Get Started
- Head to app.owenmusictheory.com
- Sign up free — no card required
- Try the free Pitch and Terms drills, or sit the free sample exam paper
- If it’s helping, upgrade for full access to every section and unlimited randomised papers
Grade 5 Theory is a one-time hurdle standing between you and your next practical grade. Practising smart — with realistic questions, instant feedback, and proper timed conditions — is the difference between walking in anxious and walking in ready.
Good luck!
