Hi,

The plot thickens:
"Oft in the Stilly Night" is apparently from Moore's "National Airs", with music provided by John Andrew Stevenson. The claims I encountered so far is that he did not write the music for this poem, but arranged an existing, Scottish tune. Indeed poetry collections list the poem itself with a subtitle of "Scotch Air" as well.

Irish or Scottish, then? It may be 'Lassie W' the Yellow Coatie' is the closest to the mark after all.
I'll go see if I can find the root publication on-line somewhere.

Bye
                                                                  Mysha