Here's a rather haunting and hypnotic piece, called Japura River, composed by Philip Glass, and performed by Uakti, a musical ensemble from Belo Horizonte, Brazil.
Japura River is from Uakti's CD, "Aguas da Amazonia".
The original Uakti was a huge creature out of an Amazon legend. It had holes all over its body, and, whenever it ran through a forest, intriguing and exotic sounds came out of its body as the wind blew through it.
Listening to Uakti performing Japura River, while closing one's eyes, one can easily believe this.