Kecak Dance

Kecak (pronounced [ˈketʃak], alternate spellings: Ketjak and Ketjack) is a form of Balinese music drama, originated in the 1930s and is performed primarily by men, although a few women's kecak groups exist as of 2006.
Also known as the Ramayana Monkey Chant, the piece, performed by a circle of 150 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. However, Kecak has roots in sanghyang, a trance-inducing exorcism dance.