two-year-old oratilwe hlongwane , from johannesburg , south africa , whose dj name is aj , is still learning to put together words but the toddler is already able to select and play music from a laptop , has become a phenomenon in south africa that his mother refiloe marumo , who wears nappies and does not yet go to school , plays bass-heavy house music on dj decks after teaching himself how to use the gadget and started fiddling .