Which hymnal did you find it in, Leeneia? I found an online source for the lyrics, but couldn't find it in print. The Lutheran Manual on the Liturgy (ELCUSA) says the song, #146 in the Lutheran Book of Worship (1978), can be used instead of the Exsultet, the Easter Proclamation. If you look at the text, you'll see it is very close to the Exsultet. The hymn will not appear in the new hymnal, Evangelical Lutheran Worship (2006).

The tune I see associated with it is Waechterlied (watchman's song) - can't find that one, either. Cyber Hymnal didn't help at all.

Rejoice, Angelic Choirs, Rejoice
(attributed to Augustine of Hippo)

Rejoice, angelic choirs, rejoice! Rejoice now, all creation!
Let trumpets loudly raise their voice to hail the Lord's salvation;
Let all Christ's holy priesthood sing
The triumph of their mighty king
In festive celebration!

O earth, exult in radiance bright, illumined by Christ's splendor!
Your darkness now is put to flight; to him due praises render!
Be glad, O Church! Sing out your songs!
Your temples fill with shouting throngs
To hail the glorious victor!

Let all who gather round this flame, the sign of Christ's arising,
The deathless light of Christ accplaim, His saving mercy prizing;
That all may live by faith in Him
Who conquered death, despair and sing,
To make us his forever.

Labels: 11th c., latin

Tune: Waechterlied


Source: http://poor-hymnal.blogspot.com/2007_04_01_archive.html

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You can hear the tune at the LBW Online Hymnal. Is that the tune you played, Leeneia?
If not that, how about this one?
-Joe-