The pan flute or pan pipe is an ancient musical instrument based on the principle of the closed tube, consisting usually of five or more pipes of gradually increasing length (and, at times, girth). The pan flute has long been popular as a folk instrument, and is considered the first mouth organ, ancestor of both the pipe organ and the harmonica. The pan flute is named for its association with the rustic Greek god Pan. The pipes of the pan flute are typically made from bamboo or giant cane; other materials used include wood, plastic, and metal. Called zampoña in Spanish, both curved and traditional South American variations are also very popular in Peruvian traditional groups and other Andean music. It is traditionally found all across the Andes, but is more typically associated with music from the Kollasuyo, or Aymara speaking regions around Lake Titicaca.