• South Africa's newest opera star  
• Singer's tribute to Mandela  

African Voices highlights Africa's most engaging personalities. This week Errol Barnett speaks to Dr. Kwabena Frimpong-Boateng, a heart surgeon and founder of Ghana's only cardiothoracic center.

Showtimes: (all times GMT) Friday : 0730; Saturday : 1430; Sunday : 0800, 1730; Monday : 1030, 1730; Tuesday : 0530

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• Connecting Africa's internet industries  
• Africa's role in the world wide web