"Terretektorh" is an orchestral composition by the Greek-French composer Iannis Xenakis, completed in 1966. The piece is notable for its innovative spatial arrangement, distributing 88 musicians throughout the audience area, immersing listeners within the orchestral soundscape.

Terretektorh by Iannis Xenakis is designed with musicians placed throughout the audience, creating a surround-sound effect that makes listeners part of the performance. This setup moves away from the traditional orchestra layout, allowing sound to come from different directions and highlighting the role of space in the music. The piece includes a wide range of pitches and dynamics, along with unusual playing techniques, giving it a unique and experimental sound.^[1]