Par AHO KALEVI. Kalevi Aho (b. 1949) composed ER-OS in 2015 as a wedding gift for conductor-clarinetist Osmo Vänskä and violinist Erin Keefe and named the work with the initials of their names. The virtuosic work is divided in three parts, the overall duration c. 11 minutes. The package includes two copies of playing score (page size B4)./ Répertoire / Violon et Clarinette