Roaring pair of bagpipes - two bagpipes is definitely cause for misery **BG***
Willow is very springy so it was used as the return spring on the bellows, which probably made a wheezing noise not unlike parody of bagpipes.
For chapter and verse we could always summon the help of Mrs Lemon - why? because as has been pointed out, genus salix - hence it's nickname Sally. Now Mr Lemon, as it happens, makes living willow sculptures for gardens and schools, (available for bamitzfas). AND Mrs lemon's real name? Sally. Call me a completeist but I regard that as neat and tidy!
BTW FWIW they both make real lemonade and will both be out in force a week on Sat for the Bishops castle Folk w/e see mrslemon.co.uk (what else?)