Dissonance
Dissonance in music refers to combinations of sounds perceived as tense, unstable, or unresolved. The term originates from the Latin dissonare (to sound apart) and describes intervals or chords that create an expectation for resolution to a more stable harmonic state. Dissonance is fundamentally relational—its character and impact depend on cultural context, historical period, and the listener’s familiarity with musical conventions.
Harmonic Function
In Western harmonic theory, dissonance contrasts with consonance, which describes sounds perceived as stable and complete. Common dissonant intervals include minor seconds, tritones, and major sevenths, while perfect unisons, octaves, and fifths are typically considered consonant. However, these classifications are not absolute; the same interval may function differently depending on its musical context and the style or era in which it appears.
Historical and Cultural Perspectives
The perception of dissonance has evolved significantly across musical history. Intervals considered harshly dissonant in medieval or Renaissance music became accepted and even fundamental to Baroque and Classical harmony. In twentieth-century classical music, composers like Schoenberg and Stravinsky used dissonance as a primary compositional tool rather than as tension requiring resolution. Different cultural traditions also define dissonance distinctly—what sounds unstable in Western tonality may carry different meanings or acceptance in non-Western musical systems.
Compositional Use
Composers employ dissonance strategically to create emotional effect, maintain listener interest, and build formal structure. Dissonant chords or intervals can generate suspense, express discord or conflict, or simply provide contrast within a musical passage. The resolution of dissonance to consonance remains a fundamental principle in much Western music, though modern and experimental composers have challenged this convention by leaving dissonance unresolved or treating it as an independent sonority.