Hear the distance.
Every interval is a distance. A minor second is one semitone — the smallest step. A perfect fifth is seven — the widest consonance. Train your ear to name these distances by sound alone. The chromatic circle shows each interval as an arc. Wider arc, larger distance. Your ear already knows the difference. This tool gives you the words.
Easy starts with the most distinct intervals — thirds, fourths, fifths, octave. Medium adds seconds, sixths, sevenths. Hard includes all twelve, with ascending and descending mixed. Start easy. Graduate when accuracy stays above 80%.
Do not count semitones. Listen for the feeling. A minor third sounds dark. A perfect fifth sounds open. A tritone sounds unstable. Each interval has a personality. The reference songs help anchor that character to memory.
After each answer, the interval map shows both notes on a chromatic circle. The arc between them is the interval — small arc means close, large arc means distant. Over time this spatial image reinforces the auditory sensation. Intervals are distances. See them that way.
Low note then high note. The default starting mode. Your ear follows the pitch upward and measures the gap. Most reference songs use ascending intervals.
High note then low note. Harder than ascending for most people. The same distance sounds different going down. A descending minor second feels like gravity. A descending perfect fifth feels like a question.
Both notes played simultaneously. You hear the interval as a blend, not a sequence. Consonant intervals fuse into one sound. Dissonant intervals create beats and roughness. This is closer to how intervals appear in actual chords.
Random direction each round. The ultimate test. You cannot rely on direction cues — you must recognize the interval by its inherent quality regardless of how it is presented. This is how a working musician hears.
Intervals are the atoms of music. Every melody is a sequence of intervals. Every chord is a stack of intervals. If you can hear intervals, you can decode anything.
The spaced repetition engine tracks your accuracy per interval and shows weaker ones more often. The intervals you confuse most are the ones you practice most. Weakness becomes frequency becomes strength.
The chromatic circle is not a metaphor. Pitch class space is circular — after twelve semitones you return to the same note an octave higher. The interval map renders this literally. A tritone bisects the circle. A perfect fifth spans just over half. These shapes become intuitions.
Reference songs are training wheels. 'Here Comes the Bride' anchors a perfect fourth. 'Star Wars' anchors a perfect fifth. Eventually you will not need the song — you will recognize the interval directly. That is the transition from association to perception.
Wrong answers teach more than right ones. When you hear a major third and guess a perfect fourth, the feedback shows both intervals side by side. The contrast sharpens the boundary between them. Every mistake is a calibration event.