Dissonant intervals are combinations of notes that create a sense of tension or instability in music. Unlike consonant intervals, which sound harmonious and pleasant, dissonant intervals often evoke feelings of unease or conflict. Common examples include the minor second and the tritone, which are frequently used in various musical genres to add drama and complexity. In music theory, dissonance plays a crucial role in the overall structure of a composition. It often resolves into consonant intervals, creating a satisfying release of tension. Composers like Ludwig van Beethoven and Igor Stravinsky have effectively used dissonant intervals to enhance emotional expression in their works.