Sackpip

Sometimes known as a Sackpimp, a droning human instrument fitting under the arm and powered by a bellows. The compressed air goes through a series of pipes producing what Dwarves call "the sweetest music ever produced by humans."
There is a fierce rivalry between those who devote their lives to the Sackpip and those who play the more traditional Bagpipes.
Often, you can see them in glades and parks, facing each other in musical combat, pushing and sweating and straining and piping, piping, piping in the park as if their lives depended on it.