Panic room- sound

Panic room begins with sequence of birds eye view of New York. The soundtrack begins before the actual sequence, however the deep sounds of the orchestral instruments begins when the first credits appear. The sound is non-diegetic (the soundtrack) and diegetic (sound of cars and sirens). The diegetic sound gives us a sense of the atmosphere in the busy city. 

After the title of the film appears the music speeds up, building tension, the diegetic sound of the cars also gets louder again giving you a sense of the atmosphere in the stressful city. The non-diegetic sound then slows down again towards the beginning of the diegetic sound of the two characters speaking. This calms the scene down again as the beginning of the film is not action packed.