CHALUMEAU is a word having several different musical meanings (from Lat. calamus, a reed) . Thus it is the name of an obsolete wind instrument, with a single beating reed, of the clarinet type; and also of a later instrument, with a double reed, which developed into the oboe. It is used also for the deepest notes of the clarinet and further, in its German form of Schalmey or Schalmei, for the chanter of the bag-pipe and for an old kind of organ stop of chalumeau-like quality.