If this URL works, you will find sheet music for "My Love's an Arbutus," which uses the same melody as "the Fisherman's Night Song."

If it doesn't work, google this:

"my loves an arbutus" sheet music

and you will find some good links.

For me, the challenge was to transcribe the notes without accidentally absorbing the lyrics to "My Love's an Arbutus," which threatened to be both cloying and adhesive.