“Hoi Song” / “(r)tu(r)n” is a sound art installation and research project by the two artists Nhung Nguyen and Zach Sch, based in Vietnam. It will be presented at Sàn Art - a gallery and educational platform in Ho Chi Minh city. In this work they explore the legacy and interconnection of the French colonial empire over the course of the 20th century. They approach this through extensive study of archival material from Humboldt University of Berlin as well as other sound archive collections, focusing on oral history about African and Vietnamese fighters during the two world wars. The two artists are interested in their experience during the war times, their living conditions, their feelings and the memories being recalled roughly 60 years after World War II. Their work is then presented through the use of short range radio transmission and spoken word collages, basing itself in explorations previously done in Nguyen Thien Dao's compositions for vocal and percussion.