A diminished chord is a triad characterized by a root, a minor third, and a diminished fifth. An example of this chord construction begins by selecting a root note. Subsequently, a minor third, which is three semitones above the root, is added. Finally, a diminished fifth, which is six semitones above the root, completes the chord.
The significance of the diminished chord lies in its inherent instability, making it useful for creating tension and leading the listener’s ear to a resolution. It can be employed to add harmonic color and complexity to musical compositions. Historically, composers have utilized this chord type to evoke feelings of unease or drama, or to create smooth transitions between different key areas.