The orchestra in Carl Orff's De temporum fine comoedia is quite unconventional: there are no strings in its composition, except for eight double basses and a consort of violas da gamba; there are no oboes, but there are eight trumpets and six trombones. Six pianists and an organist take part in the performance, as well as 15 percussionists who play about a hundred different instruments, including congas, darbuka, timpanetto, hyōshigi and other ‘exotic’ instruments. Vocal techniques in the parts of Sibyls and Anchorites are also unusual, besides, these roles require great acting and choreographic skills. No wonder that Orff's opera is so rarely produced on world stages. Meanwhile, Teodor Currentzis addressed this score three times: in 2008 at the Territory Festival together with director Kirill Serebrennikov, in 2022 at the Diaghilev Festival with director Anna Guseva, as well as at the Salzburg Festival, where the production was staged by Romeo Castellucci. Ilya Gaisin is going to reveal musicAeterna's secrets: how the Perm production differs from the Salzburg one, why noise electronics and ready-made recordings of the orchestra and choir were added to Carl Orff's score, what special techniques were used to adapt the opera to the post-industrial space of the Shpagin Plant.