Pan flute & Pan pipe
The pan flute or pan pipe (also known as panflute or panpipes) 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.
Another term for the pan flute is syrinx, from Greek mythology, the story of Pan. The plural of syrinx is syringes, from which the modern word syringe is derived. (Pan pipes is both singular and plural.) Other names for the instrument are mouth organ, Pandean pipe, and the Latin fistula panis.
The pan flute is played by blowing horizontally across the open end against the sharp inner edge of the pipes. Each pipe is tuned to a keynote, called the fundamental frequency. By overblowing, that is, increasing the pressure of breath and tension of lips, odd harmonics (notes whose frequencies are odd-number multiples of the fundamental), near a 12th in cylindrical tubes, may also be produced. The Romanian panflute has the pipes arranged in a curved array, enabling the player to easily reach all the notes by simply swiveling their head. These instruments can also play all the sharps and flats, with a special technique of both tilting the pipes and jaw movement, thus reducing the size of the pipe's opening and producing a change in pitch. An advanced player can play any scale and in any key. There are two styles of vibrato possible, hand vibrato and breath vibrato. In hand vibrato, the player applies a gentle motion to one end of the panflute (usually the high end) in much the same way as the violin vibrato is achieved by rocking the hand from the wrist. Breath vibrato is the same technique used by players of the flute and other woodwinds by use of the player's diaphragm.