What is a Minor Third?

A minor third is a musical interval that represents the distance between two notes that are three semitones apart. In Western music theory, a semitone is the smallest step between two pitches in the standard tuning system. For example, the distance between the notes A and C forms a minor third.

The minor third has a distinctive sound that is often described as darker or more emotional compared to other intervals. It is an important component in minor chords and minor scales, which are commonly associated with more melancholic or dramatic musical moods. For instance, a basic A minor chord is built from the notes A, C, and E, with the interval between A and C forming a minor third.

Minor thirds appear frequently in melodies, harmonies, and chord progressions across many musical genres. They play a key role in shaping the emotional character of music and are widely used in classical, jazz, pop, and film scoring. Because of their expressive quality, minor thirds are one of the most important intervals in music theory.