Possible Clues:

• Islamic law
• Rearrange hair? In African country it's the law!
• Muslim law
• The Islamic code of religious law
• Branch of Islam preserving Arabic legal system
• Ordered hair to be hidden in Saudi Arabia: it's the law
• Quiet song that's followed religiously
• Lousy hair in African country is legislated for in Saudi Arabia
• Rearrange hair? In African country it¿s the law!
• Quiet song conveys a religious code