The concept of the "tritone," comprising three whole tones, is a dissonant interval once called "diabolus in musica" or "the devil in music" for its unsettling sound. During the Middle Ages, this interval was often avoided in composition due to its perceived malevolence. Interestingly, it's a critical component in establishing tension in modern music, from blues to heavy metal. Its resolution creates a sense of fulfillment, exemplifying how dissonance is integral to the emotional impact of music. What's a musical element that intrigues or surprises you? Share your thoughts!