Muslims are greatly encouraged to perform their five daily prayers in congregation, and in the Mosque. A Mosque, in its most basic form, is simply a clean area designated for prayers. Mosques throughout the world have taken on various architectural forms, reflected local cultures. They range from detached pavilions in China to elaborate courtyards in India; from massive domes in Turkey to glass and steel structures in the United States. However, one unique and obvious feature remains - the "call to prayer." The first person to call Muslims to prayer was a freed African slave from Abyssinia, Bilal ibn Rabah. He was a beloved companion of Prophet Muhammad. Bilal's rich and melodious voice called the Muslims of Madinah to prayer five times a day. A translation of the call to prayer: God is Greater, God is Greater; God is Greater, God is Greater. I testify that there is no deity except God; I testify that there is no deity except God. I testify that Muhammad is the messenger of God; I testify that Muhammad is the messenger of God. Come to prayer! Come to prayer! Come to success! Come to success! God is Greater! God is Greater! There is no deity except God.