Answer
Harmony and color are the defining characteristics of Dutilleux's music. His compositions are marked by a unique blend of rich, lush harmonies and vibrant orchestral colors. Dutilleux carefully selects and combines timbres to create a distinct sonic landscape, resulting in music that is both emotionally evocative and intellectually stimulating. His attention to detail and mastery of orchestration have made him one of the most respected composers of the 20th century.