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What is an interval, and why train it?
An interval is simply the distance between two notes. A perfect fifth is seven semitones. A major third is four. An octave is twelve, the distance at which a note repeats at double the pitch. These distances are the building blocks of melody and harmony, and musicians who can hear them have a practical superpower: they can work out a tune by ear, sing a harmony part without a score, and spot a wrong note in a chord instantly. This interval ear trainer builds that skill one question at a time, with real sounds and instant scoring, so you always know whether you are improving.
The training method is deliberately simple. The tool plays two notes, one after the other, and you guess the interval between them. There is no sheet music, no theory test, and no timer pressuring you. You listen, you choose, and you find out immediately whether you were right. That immediate feedback is the whole method: your ear learns by comparing what it expected with what was actually played, and the comparison only works if the answer comes right away. Delayed feedback, like checking answers at the end of a worksheet, teaches far less.
How to practise without frustration
Start on the easy setting, which only uses intervals up to the perfect fifth. These are the intervals that appear most in melodies, and learning them first gives you early wins that keep you practising. Play each question, guess, and then, whether you were right or wrong, play it again and listen for the quality of the distance. A minor third sounds darker than a major third, even though they differ by only one semitone. A perfect fourth sounds open and stable. A tritone sounds tense and unresolved, which is why it has a dramatic reputation. Naming those feelings in your head helps your ear file each interval in the right place.
When the easy set feels comfortable, switch to all intervals. The sixths and sevenths are harder because they are wider and less common in simple melodies, but they are also the intervals that make harmonies sound rich. Practise them in short sessions of five to ten minutes. Ear training is tiring in a way that finger practice is not, because it demands full attention, and tired ears guess randomly. A short, focused session every day will move you further than one exhausting hour on a Sunday.
Common mistakes and how to fix them
The most common mistake is confusing a major and minor version of the same interval, for example a major third and a minor third. The fix is to learn them as a pair: play both, back to back, and listen for the single semitone that changes. Another common mistake is hearing the second note relative to the wrong starting note, especially when the first note is unfamiliar. The fix is to sing the first note back before guessing, which anchors your ear. A third mistake is rushing. There is no penalty for pressing Play again, and replaying a question is not cheating: it is listening, and listening is the skill being trained.
It also helps to connect intervals to songs you know. The first two notes of many famous melodies are textbook intervals: an octave, a perfect fifth, a minor third. Once you attach a song to an interval, recognising it becomes a memory task instead of a calculation, and memory is faster than calculation. You can build your own list as you practise: every time an interval clicks, write down a song that starts with it, and review the list before your next session.
Who this is for
Singers use interval training to sing harmonies and stay in tune. Instrumentalists use it to learn songs by ear instead of hunting for sheet music. Songwriters use it to hear a melody in their head and write it down accurately. You do not need any prior theory to start, and you do not need an instrument, because the tool plays the notes for you. All you need is headphones, a few minutes, and the willingness to guess wrong for a while. Every musician who can identify intervals by ear started exactly there, guessing wrong and learning from the correction. Your score and streak are shown after every answer so you can watch the guessing turn into knowing.