Marktsackpfeife (f)
(with) definite article: dieBagpipe, mouth-blown: nr. of stocks? (2-4 pipes: chanter type? / [additional] drones? [in ? stocks])
According to Wikipedia, "a very loud-sounding mouth-blown bagpipe with a conical chanter and 1-3 drones; The name stands for loud bagpipes of various designs at medieval markets; Originally, bagpipes that were named this way were played at ordinary folk festivals in the former German Democratic Republic [Deutsche Demokratische Republik; 1949-1990 (WS)]; The modern market bagpipe was developed in the early 1980s" [WS: by several makers, though Wikipedia mentions only 2 by their names]; NB: On the website of the German Dudelsack-Akademie (Hofheim am Taunus, Hesse) the instrument is just called Marktsack.
Wikipedia provides a detailed description and background information.