An Ulster song, most likely, which invokes the “lennan-shee” (Irish/Gaeilge: leanán-sí or fairy lover) tradition. The Fairy Lover songs/tales all told of fairies who steal love and leave. The video is from a live performance by Irish singer/songwriter Lisa Hannigan who recorded the songs with The Chieftains.
My Lagan Love
(lyrics by Joseph Campbell, aka Seosamh MacCathmhaoil)
1) Where Lagan stream sings lullaby
There blows a lily fair
The twilight gleam is in her eye
The night is on her hair
And like a love-sick lennan-shee
She has my heart in thrall
Nor life I owe nor liberty
For love is lord of all.
2) Her father sails a running-barge
‘Twixt Leamh-beag and The Druim;
And on the lonely river-marge
She clears his hearth for him.
When she was only fairy-high
Her gentle mother died;
But dew-Love keeps her memory
Green on the Lagan side.