Dudelei (f)
(with) definite article: dieAccording to Duden Oxford colloquial, derogatory "tootling" [NB¹: "to tootle": to play a wind instrument (➺ "Dudanica"; NB²: Also "to drivel" (to talk through one's hat)].
Duden: Die deutsche Rechtschreibung (Duden Band 1). Mannheim, &c., 1991 (20, revised)
Duden Oxford Großwörterbuch Englisch [German-English & English-German]. Mannheim, &c., 2005 (3, revised)
ws (linguistics [➺ Dictionaries, &c.])