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Grade 3 - Intervals (Part 1)

Spot intervals fast. Use the major scale method to name major and perfect ones, and shrink by a semitone to find minor.

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Fascinating Fact:

Build the major scale from the lower note. If the upper fits the scale, it is major or perfect. One semitone smaller makes minor.

In Specialist Music Theory Grade 3, you learn to name intervals by number and quality. Count the letter names for the number, then use the major scale method to decide the quality.

Key Terms

Interval: The distance between two notes, described by a number and a quality.
Semitone: The smallest step in common Western music, such as from E to F or B to C.
Perfect interval: A unison, 4th, 5th, or octave that matches the major scale exactly.

Frequently Asked Questions (Click to see answers)

How do I identify an interval in Grade 3 music theory?

First count the letter names to get the interval number. Then build the major scale from the lower note. If the upper note fits, it is major or perfect. One semitone smaller makes it minor.

Which intervals are perfect and which are major or minor?

Perfect intervals are unison, 4th, 5th, and octave. Seconds, thirds, sixths, and sevenths are major if they fit the major scale and minor if reduced by one semitone.

What is the difference between a tone and a semitone?

A semitone is one half step, like E to F. A tone is two semitones, like C to D. Interval quality depends on the exact number of semitones.