African traditional music is frequently functional in nature. Performances may be long and often involve the participation of the audience. There are, for example, specialised work songs, songs accompanying childbirth, marriage, hunting and political activities, music to ward off evil spirits and to pay respects to good spirits, the dead and the ancestors. None of this is performed outside its intended social context and much of it is associated with a particular dance. Some of it, performed by professional musicians, is sacral music or ceremonial and courtly music performed at royal courts.