A trill / shake performed on a bagpipe; Mentioned in the "Historical sketch of the Scotch bag-pipe" in »Glen’s collection...«, part 1 (1870), in which it is stated that some George Mackie used it to make "a great improvement in his style of playing"; NB¹: The term is a derivation of the verb "to warble" (sing melodiously with trills, quavers, &c. like a bird; Interestingly, in dictionaries the defintion of warbler is actually "any of a family of small songbirds related to the thrushes"); NB²: ➺ Warble pipe.

Shake, Trill