skirl 
(skûrl)
(skûrl)v. skirled, skirl·ing, skirls
v.intr.
To produce a high, shrill, wailing tone. Used of bagpipes.
v.tr.
To play (a piece) on bagpipes.
n.
1. The shrill sound made by the chanter pipe of bagpipes.
2. A shrill wailing sound: "The skirl of a police whistle split the stillness" (Sax Rohmer).
[Middle English skrillen, skirlen, probably of Scandinavian origin.]