The great Highland bagpipe is classified as a woodwind instrument, like the bassoon, oboe, and clarinet. Although it is further classified as a double-reed instrument, the reeds are all closed inside the wooden "stocks", instead of being played directly by mouth as most other woodwinds are. The great Highland bagpipe actually has four reeds: the chanter reed (double), two tenor drone reeds (single), and one bass drone reed (single).
