The Collar Bone of a Hair - Sheet music?

Whistle
1

Looking for the subject sheet music. It’s a very beautiful slow air. It might be known by another name. If you want to hear it:
http://www.tinwhistletunes.com/clipssnip/Audio/08-07/CollarboneOfHarePatO.mp3

Thanks, Cyril.

2

?

Is the title an attempt to render the sound of gaelic words in english? Is there an irish phrase starting with something “Caillin …” buried in this?

3

At very least I would think you’d have to be careful with the homonyms hair and hare when searching for sheet music.