WINTER chokes the highveld in Johannesburg, South Africa, and takes from me, from our entire culture, a mighty mountain. Gabriel Mabi Segwagwa Thobejane, the diminutive tower of rhythmic power, has left us: a man who did not so much play the drums, but became The Drum. DAVID COPLAN, Professor Emeritus, Social Anthropology, University of the Witwatersrand He reportedly suffered a stroke at the age of 74 and passed on 3 June 2021. Even though he was both master and a creator of South Africa’s indigenous sonic archive, Mabi, as we all came to call him, was also a showman and…