A drone pipe is a type of musical instrument that produces a continuous low-frequency sound. It is commonly associated with bagpipes and other traditional folk music from various regions around the world. However, there are several synonyms for the term "drone pipe" that refer to similar instruments with slightly different features. These include bass drone, bourdon, drone reed, and pedal drone. Each of these terms is used to describe a specific type of drone pipe that is widely used in different musical contexts. Overall, drone pipes are essential to creating the distinct sound and character of traditional folk music.