Answer:
twelve-tone music
Step-by-step explanation:
Twelve-tone music is a technique for composing music in which the composer uses all 12 pitches of the chromatic scale in a fixed and specific order, known as a tone row. This approach allows for the creation of music that is highly structured and organized, but also allows for a great deal of variation and flexibility within that structure. Schoenberg's development of the twelve-tone model was a major contribution to modern music theory and composition, and has influenced many other composers and musical styles.