Today is the Feast of the Most Holy Body and Blood of Christ, more commonly known as Corpus Christi, the day set aside by the Church in honor of the Eucharist. Traditionally, the celebration of Corpus Christi includes the Lauda Sion sequence, which I was fortunate enough to hear sung in Latin at Mass today. The words were written by St. Thomas Aquinas; what follows is an English rendition, compliments of Wikipedia.
Oh, and to actually hear the chant—compliments of Archive.org—simply follow this link. Gotta love the internet.
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Sion, lift up thy voice and sing:
Praise thy Savior and thy King,
Praise with hymns thy shepherd true.
All thou canst, do thou endeavour:
Yet thy praise can equal never
Such as merits thy great King.