The piece is in only one movement and takes around 12 minutes to perform. It is scored for four first violins, three second violins, two violas, two cellos and one double bass, even though it is clarified by Xenakis that it can also be performed by a larger string orchestra or ensemble. Aroura makes an extensive use of glissandos, jagged chords, sound clusters and other techniques exploited in avant-garde movements.[1]
The piece has a tempo of 𝅗𝅥 = 60 (which means two beats per second). The register of the piece ranges from a C1 (played by the double bass) to D8, played by one of the first violins. First and second violins rarely play unison, but each of the violinist has their own line. Xenakis uses graphic notation up to six times in the score, the first one being the opening of the composition.[3]
^ abSimeone, Nigel (2013). Iannis Xenakis - Synaphaï (Liner Notes of Decca 478 5430). London: Decca Music Group Limited. p. 4.
^"Aroura". iannis-xenakis.com. Les Amis de Xenakis. Retrieved 21 March 2015.
^Meza Ramírez, Sinuhé Fernando (June 23, 2013). "Aroura" – Iannis Xenakis Graficación y Análisis. Morelia: Universidad Michoacana de San Nicolás de Hidalgo. pp. 2–6.