The chant ("mele") is typically accompanied by an "ipu heke" (a double gourd) and/or "pahu" (sharkskin covered drum). Some dances require dancers to utilize hula implements such as an "ipu" (single gourd), "iliili" (waterworn lava stone castanets),"uliuli" (feathered gourd rattles), "pu`li" (split bamboo sticks) or "kalaau" (rhythm sticks). The older, formal kind of hula is called "kahiko", while the modern version is "auana". There are also religious chants called "oli"; when accompanied by dancing and drums, it is called "mele hula pahu".