I love the text of this Christmas song by Mary Louise Bringle based on Isaiah 9:1-6 with its obvious liturgical applications. The tune by Sally Ann Morris works well too, but I’d bring it down from Gm to Em for an assembly ie play the chords without the suggested capo 3 setting.
The lyrics are in a preview at Hymnary, but GIA only seem to have a handbell version of the sheet music to buy there. It is in RitualSong and Gather 3rd and 4th editions, if you have those collections.
Whenever I see 6/8 time I go Irish I’m afraid. BIAB doesn’t have a lot of 6/8 styles and dislike just using waltz time.