Here is the Sequence for Corpus Christi!
sheet music- CChristiSequenceinEnglish
in Latin Sung by Jeff Ostrowski
“We will take the sequence ‘Lauda Sion’ from the Mass of Corpus Christi,” announced Dame Maura. “It was written by St. Thomas Aquinas and is set to the melody of a sequence of Adam of St. Victor, so it is not very old, only thirteenth century.” … “Stand properly,” Dame Maura had told the girls in their half-circle. “You can’t sing if you slouch. Keep your hips behind your shoulders. Eyes should be down,” she said to Cecily, “so that you can follow what you are reading,” and to everyone, “pronounce the e‘s as in ‘met’ and bring the d‘s well forward.”
from In This House of Brede by Rumer Godden