For a moving tune that is sure to stir your soul and heartstrings, please seek out recordings or, (if you're a violist/fiddler or cellist) the sheet music of a beloved melody by the 19th Century Scots fiddler and music collector Neil Gow, named Neil Gow's Lament on the Loss of His Second Wife. I well up just thinking about it.
from the Gaelic word caoineadh: (v) to weep, to wail, to lament; (n) a lament.
It used to be common in rural areas to hire professional mourners, sometimes known as keeners, or keening women, at wakes and funerals. Nowadays, not so much.
One of the most famous love poems in the Irish language is the dirge, Caoineadh Airt Uí Laoghaire, or the Lament for Art Ó Laoghaire, written by his wife Eibhlín Dubh Ní Chonaill in the late 18th century.