Llawygath wrote:Nice idea.

However, I must say, the first thing that came to my mind when I saw this was "why do concultures have to celebrate Christmas?". I'm sure many of us, myself included, would be unable to translate these carols owing to lack of vocabulary for their Christian-centric religious themes.

I often make hypothetical vocabulary for my conlangs. What if they knew about cars and computers and Earth religions? What would they call them? In any case, not all carols are religious. "Jingle Bells" for example.
Here's one of my favorite carols, "Angels We Have Heard on High", in Selvesco. For the sake of rhythm, it's traditional to occasionally contract plural endings if it won't result in a cluster of more than two consonants (ángelos > ángel's). In addition, bisyllabic articles are shortened to single syllables (eli > 'li) or combined with nouns beginning with vowels (eli himno > l'himno). "Gloria in excelsis Deo" is inserted after each verse.
Ês ángel's en nuostris campis
Cantan l'himno de loór
E el eco entra ês montanhis
Reviede el gúoǧ del Senhór
Gloria in excelsis Deo
Gloria in excelsis Deo
Pastores, porvé ela fiesta?
Vé evuogat vuostra ledéč?
Vál vičór, vál gránt combiesta
Mieret vuostra bíel cantéč?
Es venida ela nascienča
Del salvadór Belemi
Plenos de reconhoscienča
Víent vér 'li nuovo reï[ɛs ˈand͡ʑɛls ɛn ˈnustɾɪs ˈkampɪs]
[ˈkantan ˈlɪmno de loˈɔɾ]
[eːl ˈeko ˈɛntɾa͡ɛs mɔnˈtaɲɪs]
[reˈvideːl ˈgud͡ʑ dɛl seˈɲɔɾ]
[pasˈtoɾɛs pɔrˈveːla ˈfista]
[ˈveːˌvugat ˈvustɾa leˈdɛt͡ɕ]
[ˈval vɪˈt͡ɕɔɾ ˈval ˈgɾant kɔmˈbista]
[ˈmirɛt ˈvustɾa ˈbil kanˈtɛt͡ɕ]
[ɛs veˈnida͡ela naˈɕint͡ɕa]
[dɛl salvaˈdɔɾ beˈlemɪ]
[ˈplenɔs de rekoɲoˈɕint͡ɕa]
[ˈvint ˈvɛɾ lɪ ˈnuvo ˈreɪ]The angels in our countryside
Are singing the hymn of praise
And the echo among the mountains
Repeats the joy of the Lord
Gloria in excelsis Deo
Gloria in excelsis Deo
Shepherds, why this celebration?
What calls forth your happiness?
What victor, what great conquest
Deserves your beautiful song?
It is come, the birth
Of the savior in Bethlehem
Full of gratitude
Come and see the new king
EDIT: Fixing pronunciation
N'hésite pas à corriger mes erreurs.