Chor Choir Choeur is an on-going project that focuses on the process-oriented facets of choir practice. It comprises a collection of compositions by Siedl/Cao for multiple voices in specific local contexts and media combinations. The overarching aim of Chor Choir Choeur is to construct an architecture that enables the natural unfolding of human expression.













Photos from the performance of Chor Choir Choeur IV by Green Wind Choir at the Outpost Art Organisation, Hanoi
This project delves into the process of self-exploration within different social contexts, the intricate dynamics of human interaction within a group, and the exchange of ideas and aesthetic sensibility. In its pursuit of rediscovering the essence of music-making and the broader role of art in society, Chor Choir Choeur remains open to all who wish to explore artistic expression through their voices, regardless of how similar or different they may be from one another.
In the era of digital communication and AI development, we wonder what make us a human being. At the heart of this project lies the voice—a deliberate choice grounded in the belief that it is the most intimate and personal medium through which to convey thoughts, memories, physicality, personalities, and emotions.
Recent performances
CHOR CHOIR CHOEUR IV
Music theatre for Green Wind Choir, premiered at the Outpost Art Organisation, Hanoi, 18 & 19.1.2025
kindly supported by SKE Fonds Austria, Stadt Wien Kultur & BMEIA Austrian Federal Ministry of Foreign Affairs

Excerpts from the score of Chor Choir Choeur IV, written for Green Wind Choir





Xarkis Residency and Festival – Nicosia, Cyprus 2024 kindly supported by Cultural Moves Europe & BMEIA Federal Ministry of Foreign Affairs of Austria








La plus que lente – 2024 Wow!Signal Festival Vienna
Mí mơ – 2023 – Manzi Art Space Hanoi – kindly supported by the Austrian Federal Ministry for Arts & Culture




