On either side of the mixing chamber are the philharmonic’s two main performance halls, which are in turn surrounded by the “rack” of floors, which both provides access to the halls’ upper levels through a series of stairs and lifts, and hosts a wide variety of programme to activate the building’s façade. The Rack not only gives the building its lively, extroverted character but also creates an efficient, cost effective, and modular building. This simple structural approach also allows the halls themselves to be structurally detached from the surrounding building, with their own foundations and buffers, to reduce noise interference inside the performance spaces.

Multiple programs activate the Rack, including front-of-house amenities such as bars, info points, and box offices, back-of-house services such as artist receptions, recreational facilities, and crew rooms, and also a corner of the structure dedicated to educational functions. On the roof, the rack continues, with terraces to dance, eat, or to enjoy panoramic views of Belgrade.