Kecak dance (Monkey dance) is a form of Balinese music drama, originated in the 1930s and is performed primarily by men. Also known as the Ramayana Monkey Chant, the piece, performed by a circle of 100 or more performers wearing checked cloth around their waists, percussively chanting "cak" and throwing up their arms, depicts a battle from the Ramayana where the monkey-like Vanara helped Prince Rama fight the evil King Ravana.
In the Kecak, the only music is provided by a large chorus of bare-chested men and boys sitting in a circle just in front of the audience. This choir provides a constant accompaniment to the story, and even become actors towards the end.
Cost varies, and there are a few cheaper alternatives around town.