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How to build interval recognition

Start with the beginner interval set. Perfect fifth, perfect fourth, major third, minor third, octave. These are the five intervals most Western music leans on. Play, guess, replay if you must. When you can hit ten in a row across those five, add the tritone. When you can hit fifteen in a row with the tritone included, move to intermediate.

Two common mistakes. First, guessing without singing the interval back to yourself; the ear that names an interval is the ear that has heard itself sing it. Second, drilling in silence between attempts; give yourself a second to sit with the sound before the next one begins.