In the women's version, a development of earlier female genres which has recently been included within the definition of kiba, a group of women sings songs (koša ya dikhuru- loosely translated: knee-dance music). This translation has it roots in the traditional kneeling dance that involves salacious shaking movements of the breasts accompanied by chants. These dances are still very common among Tswana, Sotho and Nguni women. This genre comprises sets of traditional songs steered by a lead singer accompanied by a chorus and an ensemble of drums (meropa), previously wooden but now made of oil-drums and milk-urns. These are generally sung at drinking parties and/or during celebrations such as weddings.