The willow flute, also known as sallow flute (Norwegian:
seljefløyte, Swedish: sälgflöjt or sälgpipa, Finnish: pitkähuilu
or pajupilli), is a Scandinavian folk flute, or whistle,
consisting of a simple tube with a transverse fipple mouthpiece
and no finger holes. The mouthpiece is typically constructed by
inserting a grooved plug into one end of the tube, and cutting
an edged opening in the tube a short distance away from the
plug. Similar, however not the same instruments were made by
peasants in Poland, usually using a different method described
in sources as "kręcenie" (that nowadays means literally
"rolling", at that time possibly also "drilling-gouging"),
"ukręcanie", "ulinianie" (nowadays literally meaning: "making
moulted"). Such instruments are mentioned in folk poems or
songs. The willow flute is a type of overtone flute. It is
played by varying the force of the air blown into the
mouthpiece, with the end of the tube being covered by the finger
or left open. The tones produced are based on the harmon