"The "Huron Carol" (or "Twas in the Moon of Wintertime") is a Canadian Christmas hymn (Canada's oldest Christmas song), written probably in 1642 by Jean de Brébeuf, a Jesuit missionary at Sainte-Marie among the Hurons in Canada.
Brébeuf wrote the lyrics in the native language of the Huron/Wendat people; the song's original Huron title is "Jesous Ahatonhia" ("Jesus, he is born")."
This version is by Loreena McKennitt who is a Canadian singer-songwriter, multi-instrumentalist, and composer who writes, records, and performs world music with Celtic and Middle Eastern influences. McKennitt is known for her refined and clear soprano vocals. https://en.wikipedia.org/wiki/Loreena_McKennitt