This composer created a microtonal metallophone named for the first three letters of his name and the word “six” for use in a percussion sextet with movements titled “Skins” and “Metals.” (10[2])This composer named a series of pieces after their number of performers, iteration numbers, and the date, (-5[1])leading to titles like ST/48-1,240162. A term for offerings to Chthonic gods titles a technically demanding harpsichord piece (10[1])by this composer that includes many passages of rapid repetitions of single notes. This composer’s book Formalized Music includes (10[1])passages (10[1])of his FORTRAN code for GENDY, a tool (10[1])he later developed into the computer music program (-5[1])UPIC (“YOO-pick”). An orchestral piece by this composer that uses sound masses produced by 61 musicians, each playing different parts, (-5[1])drew on his training in mathematics (10[1])and architecture. (10[5])For 10 (10[1])points, (10[1])Khoaï (10[1])and Metastaseis (10[2])are pieces by what (10[1])modernist Greek composer? ■END■ (10[3])