African musical instruments come in many varieties including idiophones like balafons, membranophones like djembes, chordophones like the kora, and aerophones like flutes. Many instruments are made from materials found in nature such as wood, metal, animal skins and horns. Drums can be crafted from wood, clay, gourds or animal shells. Flutes are made from reeds or bamboo. Animal horns and skins provide the raw materials for trumpets and drum membranes. African music thus incorporates a rich diversity of indigenous instruments closely tied to the local environment.