E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
The croaking of frogs in the Lincolnshire fens. We have Cambridgeshire nightingales, meaning frogs; fen nightingales, the Liège nightingale. In a somewhat similar way asses are called Arcadian nightingales.
Melancholy as the drone of a Lincolnshire bagpipe.Shakespeare: 1 Hen. IV., i. 2.