Terretektorh
Terretektorh shows more concern for harmonic organization than the earlier, iconoclastic Pithoprakta, with its scatterings of knocking sounds and massed effects. Still, the concentration is decidedly on texture and movement, with narrow lines being bundled with a number of others in the same register to create a rawer sonic intensity that still has some basis in melody. Xenakis concentrates on the high and low registers, as did Varèse before him, and adds some unusual sound effects into the mix as well.

In Terretektorh and Persephassa, Xenakis creates the impression of movement by transferring musical material between groups of musicians using techniques developed from musique concrète. These works are further innovative because of the unique seating arrangements in which the space for the performers and audience are superimposed.
In this thesis,  demonstrating Xenakis’s early approach to spatial composition. The thesis builds on the work of other scholars and provides more insight as to how these fascinating pieces work.