Musical intervals — Music, 14–17 years
An interval is the distance between two notes. Hearing and naming these distances helps musicians sing, tune, build chords and understand why some notes sound settled while others create tension.
What an interval is
An interval compares two pitches: how far apart they are, not which one comes first. A C and the next E are a third apart because C–D–E contains three note names. The same idea works whether the notes are sung, played together or heard one after another.
Why musicians need intervals
Musicians needed a precise way to describe melodies and the spaces inside chords, instead of relying only on vague words such as ‘high’ or ‘low’. Intervals solve that problem: they let people teach, copy and analyse music, even when they do not share an instrument or a recording.
Counting an interval
Take the notes A and F above it. First count the letter names: A–B–C–D–E–F, so the interval is a sixth. Then count semitones: A to F is nine semitones in equal temperament. Its name is therefore a minor sixth, not simply ‘six notes apart’.
The reasonable mistake
A common mistake is to count only the gaps between note names. That makes C to E look like two steps, although musicians call it a third because both C and E are included. The confusion is reasonable: in everyday language, a distance often means the spaces between objects, not the objects at both ends.
Intervals outside theory
Singers use intervals to learn a melody without copying every note from a recording. Instrument makers and tuners compare intervals when setting strings or keys, and audio software can measure them in a recording. Even recognising the opening interval of a song can help identify it by ear.
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