Better late than never. Hi, I'm a PK (Preacher's Kid) so I MAY have a little edge. As far as I know, "Morning Has Broken" (text) was published in 1931 by Eleanor Farjeon (1881-1965.) It is indeed a Scots Gaelic melody, originating in Bunnessan (Isle of Mull), but its meaning from the Bible, Psalms 30:5 ("weeping may endure for a night, but joy cometh in the morning".) It was adopted by mainstream Protestants early on, but even Roman Catholics sing it now. However, it's my opinion that the earlier version is a much prettier and more lyrical hymn.

Of course, I could be wrong. This is just what I learned. It's one of my favorite tradional hymns.