The sounds of Cairo have changed too often from honking horns and cries of vendors to fervent chants and the sharp thuds of discharging weapons and the chugs of helicopters. As protesters fill streets and squares the very fabric of noise that blankets the city of millions is often ripped apart by the noises of anger.
But one thing is still the same. Five times a day the plethora of minarets that pepper the skyline come to life and remind the faithful to stop what they are doing. The call to prayer rings out in a thousand voices as it has done for hundreds of years.