Original: 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).
Simplified: The pan flute or pan pipe (also known as panflute or panpipes) is an old musical instrument that has five or more pipes of gradually increasing length (and, at times, girth).