The morning after Nelson Mandela died, NPR’s Renee Montagne interviewed a white South African named Johnny Clegg, whose music I’ve listened to and loved since I saw him perform in Johannesburg in 1988. Clegg’s song, “Asimbonanga,” Zulu for “We Have not Seen Him” stopped me in my tracks and still does. Years later, at a concert in France, where Clegg is popular and known as le Zulu Blanc, he performs Asimbonanga and is joined on stage by Mandela. Wow-oh-wow,