The “Centrum Muziek XXI” music centre offers rehearsal rooms for small-scale music ensembles. The architecture gives this residential area in Utrecht its own identity. This compact 3-tier volume heads up a row of houses. At the facade facing the houses, the roof has been cut off at a 45°angle, to determine a sufficient amount of light entering the neighboring homes and gardens. Inside the building, volumes for the use of music studios and tryout halls have been organised seperately. The communal space that separates these areas consists of all daylight-related programme (entrance hall, staircase, lobby and office). This resulting 'void' space is perfect for meetings and ultimately the place to appreciate the location. A monochrome color scheme unites this conglomerate of volumes and intermediate space. The two closed music volumes with their green aluminium boarded profile are reminiscent of a ‘cultural warehouse’. The façade of the area between the two volumes consists of tinted sun-reflecting glass in four different green tints, depending on function and surface area size.