Iannis Xenakis (1922-2001) was a Greek-French composer, architect, and engineer, known for his pioneering work in the field of avant-garde music. His genre spans contemporary classical music, incorporating elements of electronic and stochastic music, which utilizes probability and random processes to structure sound. Xenakis's notable works include "Metastaseis" (1954), a groundbreaking orchestral piece that employs innovative techniques like glissandi and dense textures; "Pithoprakta" (1956), which explores the relationship between music and stochastic processes; and "Kassandra" (1960), a dramatic work for voice and orchestra. His electronic compositions, such as "La Légende d'Eer" (1977), also highlight his exploration of new technologies in music. Xenakis's impact on music is profound, influencing generations of composers and musicians. He was a key figure in the development of mathematical approaches to music composition and sound synthesis. His integration of architecture and music, along with his unique sonic language, has left a lasting legacy, making him a seminal figure in 20th-century music and a crucial precursor to contemporary experimental practices.