There are 2 copies of this song in the DT: LAGAN LOVE and MY LAGAN LOVE, plus the one above in this thread, but none of them quite agrees with the lyrics I have found here:

From Irish Writing: An Anthology of Irish Literature in English 1789-1939 by Stephen Regan (Oxford: Oxford University Press, 2004), page 389:


MY LAGAN LOVE (1904)
Joseph Campbell (1879-1944)

Where Lagan stream sings lullaby,
There blows a lily fair;
The twilight gleam is in her eye,
The night is on her hair.
But like a lovesick leanannsidhe,
She has my heart in thrall.
No life I own nor liberty,
For love is lord of all.

And often when the beetle's horn
Has lulled the eve to sleep;
I steal up to her sheiling lorn
And through the dooring peep;
There by the cricket's singing-stone
She spares the bogwood fire,
And sings in sad sweet undertone,
The song of heart's desire.


[Furthermore, some versions have a third and fourth verse, but there are no such verses in my source. I have boldfaced the words that are different from the one in this thread.]