What is a Major Third?

A major third is a musical interval that represents the distance between two notes that are four 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 C and E forms a major third.

The major third interval has a bright and stable sound and is an important element in major chords. When a major third is combined with other intervals, it helps create the characteristic uplifting sound of major harmony. For instance, a C major chord is made up of the notes C, E, and G, with the interval between C and E forming a major third.

Major thirds appear frequently in melodies, harmonies, and chord progressions across many musical styles. They play a key role in distinguishing major chords and scales from minor ones. Because of their clear and harmonious sound, major thirds are one of the most commonly used intervals in music composition and performance.