Musical intervals

An interval is the distance in pitch between two notes, measured in semitones. Recognizing intervals by ear is one of the most transferable skills in music — it underlies sight-singing, transcription by ear, understanding chord quality, and improvisation. This tool plays two notes in ascending order and asks you to identify the interval between them.

All 12 intervals with mnemonics

Interval	Semitones	Ascending mnemonic
Minor 2nd	1	"Jaws" theme (da-dum)
Major 2nd	2	"Happy Birthday" (first two notes)
Minor 3rd	3	"Smoke on the Water" opening riff
Major 3rd	4	"When the Saints Go Marching In"
Perfect 4th	5	"Here Comes the Bride"
Tritone	6	"The Simpsons" theme
Perfect 5th	7	Star Wars main theme
Minor 6th	8	"The Entertainer" (opening leap)
Major 6th	9	"My Bonnie Lies Over the Ocean"
Minor 7th	10	"Somewhere" — West Side Story
Major 7th	11	"Take On Me" chorus (A-ha)
Octave	12	"Somewhere Over the Rainbow"

How to practice effectively

Rather than drilling all 12 intervals at once, focus on 2–3 that you find most confusing per session. A common stumbling block is the minor 6th vs. major 6th, or the minor 7th vs. the octave. Pick a strong mnemonic for each and hear it internally before making a selection. Short, consistent sessions of 10–15 minutes daily build recognition far faster than occasional long sessions — the goal is to make interval recognition automatic, which only comes through repeated low-stakes repetition.

Harmonic vs. melodic intervals

A melodic interval is two notes played in sequence — one after the other — which is what this tool trains. A harmonic interval is both notes played simultaneously, as in a chord or two-voice harmony. The two skills are related but not identical: harmonic interval recognition relies more on the blend and "color" of the combined sound (a minor 3rd sounds tense and close; a perfect 5th sounds open and stable), while melodic recognition depends on the sense of upward or downward motion. Practicing both develops a complete ear.

Why ear training transfers to real playing

When you can recognize intervals on demand, transcribing a melody by ear becomes a matter of identifying one interval at a time rather than hunting randomly on an instrument. Sight-singing becomes easier because you can hear a written interval in your head before playing it. In improvisation, knowing that a major 6th above the root of a chord is the major 6th degree helps you target notes intentionally rather than relying on muscle memory alone.