This song was the entrance for Pentecost at Ryan’s parish.
I’ve blogged a reimagining on this song here from spiritandsong, but this is the original attributed to Rabanus Maurus and translated by Edward Caswell although there are several versions of the text. I’m assuming the lyrics in Gather will be for us Catholics, but you can see all the variants at Hymnary where you can also find information on LAMBILOTTE written unsurprisingly by Louis Lambilotte. The sheet music can be purchased at OCP.
Check out how happy the choir leader is with the fanfare: