 A narrow staircase in the tower leads to the control room of the carillon, which has 48 custom-made bells.From here a musician can play the instrument on special occasions or for concerts.The bells are programmed by computer to play the Westminster Quarters to announce the time between 7 a.m. and 7 p.m. One can also control the bells of the tower with a keyboard, which depending on how hard the keys are pressed, will make the bells chime louder.