An interval is the distance in pitch between two notes. Interval recognition is the foundation of relative pitch: given a reference, you can name what you just heard. Working musicians rely on this constantly, in rehearsal, in transcription, and on the bandstand.

The twelve intervals

Within an octave there are twelve semitones and thirteen named intervals (counting both perfect fourth and augmented fourth as separate). In practice you drill twelve:

• Minor 2nd (1 semitone). Anchor: Jaws theme.
• Major 2nd (2 semitones). Anchor: Happy Birthday, first two notes.
• Minor 3rd (3 semitones). Anchor: Greensleeves, opening.
• Major 3rd (4 semitones). Anchor: When the Saints Go Marching In, first two notes.
• Perfect 4th (5 semitones). Anchor: Here Comes the Bride.
• Tritone (6 semitones). Anchor: The Simpsons theme (opening interval).
• Perfect 5th (7 semitones). Anchor: Twinkle Twinkle Little Star, first to second syllable.
• Minor 6th (8 semitones). Anchor: The Entertainer, the 6-3 shape.
• Major 6th (9 semitones). Anchor: My Bonnie Lies over the Ocean.
• Minor 7th (10 semitones). Anchor: Somewhere from West Side Story.
• Major 7th (11 semitones). Anchor: Take On Me (chorus leap).
• Octave (12 semitones). Anchor: Somewhere Over the Rainbow, first two notes.

The beginner routine (weeks 1-4)

Drill five intervals only: perfect 5th, perfect 4th, major 3rd, minor 3rd, octave. These are the five that carry most Western melody. Play, guess, replay. When you hit ten in a row, add the tritone.

The intermediate routine (weeks 5-12)

Full twelve, ascending only. Ten minutes a day. When you can hit 20 in a row, add descending intervals. Descending is genuinely harder for most learners because the anchor songs go the other direction.

The advanced routine (weeks 13+)

Mixed direction, mixed timbre (piano, strings, voice). Add compound intervals (9th, 10th, 11th) once simple intervals stabilise at 90% accuracy.

Two common mistakes

• Guessing without singing. The ear that names an interval is the ear that has heard itself sing it. Sing back the second note before you commit an answer.
• Drilling in silence. Give yourself one second of quiet before the next attempt. That is when the previous answer consolidates.

Practice with the trainer

The free ear trainer defaults to the beginner set and moves through the intermediate and advanced tiers as your accuracy climbs. Streak counts persist across sessions.