Is Acher in Gaíth - Old Irish Celtic Song

Music and vocals by Farya Faraji. Please keep in mind that this is not reconstructed Irish music from the Old Irish linguistic period, only modern Irish music with an ancient theme. The lyrics of this song are in the late stages of the Old Irish language, and date from the 9th century. They were written down in the margins of an Irish manuscript, and evoke the writer's sense of relief that on that night, the sea was riddled with storms, therefore making an attack by Viking raiders impossible. This inspired me to write something hopeful with a sense of permeating melancholy: I like to imagine that the writer knows the Vikings will inevitably attack, but that they get to have one more night alive, and will spend it dancing to music. I based my pronunciation on Pádraigín Ní Uallacháin's musical rendition of this poem, but I cannot specify whether this is a reconstructed historical pronunciation, a modern one, and if modern, of which current accent and dialect of Irish.

Lyrics in Old Irish:
Is acher in gáith in nocht,
fu·fúasna fairggae findfholt,
ní·ágor réimm Mora Minn,
dond láechraid lainn úa Lothlind,

Modern Scottish Gaelic translation:
Is acar (geur) a' ghaoth a-nochd,
A' luasgadh na fairge fionn-fhuilt,
Chan eagal rèim (seòladh) na mara mìn,
Den laochraidh loinn o Lochlainn,

English translation (Kuno Meyer's translation):
Bitter is the wind tonight,
It tosses the ocean’s white hair,
Tonight I fear not the fierce warriors of Lothlend/Lochlann* (Norway)
Coursing on the Irish sea,

Alternate translation:
Bitter is the wind tonight,
It tosses the ocean’s white hair,
I fear not the coursing of a clear sea,
By the fierce heroes from Lothlend.

*Notice the usage of the term Lothlend, today rendered as Lochlann in the modern Gaelic languages and Llychlyn in Welsh. This was the exonym for Scandinavia, typically more specifically for Norway, by the Celts of Ireland and Great-Britain.