This article examines the theoretical foundations and musical significance of seventh chords as one of the essential elements of harmonic language in music theory. The study provides detailed information about the structure of seventh chords, their intervallic composition, classification, and functional role within tonal harmony. Particular attention is given to the dominant seventh chord, which occupies a central place in classical harmonic systems due to its strong tendency toward tonal resolution. The article analyzes the formation of seventh chords through the addition of a third above triads and explains the specific characteristics of major seventh, minor seventh, dominant seventh, half-diminished seventh, and diminished seventh chords. Their acoustic qualities, emotional expressiveness, and practical applications in musical composition are discussed from both theoretical and artistic perspectives.
Alimovna et al. (Thu,) studied this question.