In 1995, the City of Luxembourg decided to build a large concert hall on the Kirchberg plateau, the new district of banks and major European institutions. The aim of the commission was to bring together three major public performance spaces in a single complex: a large philharmonic hall, a small chamber music hall and a discovery space. Architect Christian de Portzamparc, admirably assisted by the experience of acoustician Xu Yaying, made this hall his great musical instrument. The elliptical shape, with its filter of white columns and coloured cliffs, reveals the auditorium as a real jewel in its setting, one of the architect's most beautiful buildings.