The final concert of the string quartets cycle by Bartók and Ligeti is a musical reflection on time, loss, and hope. An emotional and sonic journey that combines the tragedy of the past with the fragility of the present. Bartók's Sixth String Quartet is one of his most personal and emotionally charged compositions. Written against the backdrop of an impending war and personal experiences, it is imbued with sadness, emphasized by the marking "Mesto" in each of its parts. This music is a farewell to Europe, to illusions, and to the world that was rapidly collapsing. Concluding the concert cycle, OpensoundOrchestra will perform this piece as a musical monologue of a decaying era. Ligeti's composition, in turn, shows how tradition transitions into a new quality: from personal expression to the exploration of sound material. His Second Quartet is a series of miniatures where the organic nature of form combines with innovative sonic fabric. The juxtaposition of these two compositions creates a tense, dramaturgically precise dialogue between two eras - pre-war and post-war. The performance of OpensoundOrchestra, flexibly transitioning from ensemble forms to chamber sound, will mark a significant conclusion to the project. An updated program for Moscow is presented on KudaGo.