<My understanding, confirmed with a native German-speaking friend last night, is that Bordun is a musical process not connected to a specific instrument (like continuo basso) and when used with the pipes (Dudelsack) it refers to "Brummpfeife/n", i.e. the drones.
This may be historically true, but in practice in modern usage it means both. C "Die Bordune können mit den mitgelieferten Stöpseln abgestellt werden." the drones (nominative) can be switched off with the stoppers supplied. "Hümmelchen ... mit zwei Bordunen" .. With two drones (dative after "mit"). >From http://www.bagpipe.de/query.php?cp_tpl=main&cp_sid=182565295b45 chirs To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
