Luka Aron is a German musician and composer of electroacoustic and minimalist music based between Stockholm and Berlin. 'XV XXVII III XXI IX: Variations & Coda' is his debut vinyl release. Apart from his solo work, he is also a member of the trio Minua (signed to Nils Frahm's LEITER label) and the dream gaze band Roomer. His work was previously described as "thick, impasto layers of slow-moving sound that completely command your attention" in The Guardian.

'XV XXVII III XXI IX: Variations & Coda' is a four-part suite for an acoustic ensemble (bass clarinet, contrabass, euphonium, foghorn organ, harpsichord, serpent, shō, and trumpet) and analog as well digital synthesis. The result is an album of spiralling compositions which navigate labyrinthine structures of multiple closely related overtones and layers of heavy distortion based on Aron's research and observations of the physiology of hearing through minute listening tests. On the album, the composer collaborates with a number of notable musicians: Mattias Hållsten and Santos Silva (both members of the late CC Hennix' Kamigaku ensemble), just intonation contrabassist Vilhelm Bromander, or Amina Hocine, among others. The release was mastered by Stephan Mathieu at Schwebung Mastering.