Ut queant laxis is the Office hymn for second Vespers of the Nativity of Saint John the Baptist (June 24). The more famous of the two Gregorian melodies is attributed to Guido d'Arezzo and begins each phrase on a higher scale degree: hence the naming of the solfeggio notes after the first syllable of each line of the first verse.
Sit decus Patri,
genitaeque proli
et tibi, compare
utriusque virtus,
Spiritus semper,
Deus unus, omni
Temporis aevo. Amen.
English translation
So that your servants
may, with all their voice,
sing your wonderful feats,
clean the blemish
off our tainted lips,
Saint John.
An angel came from
high Olympus [heaven]
to foretell
your great birth
to your father,
spelling your name
and your fate.
He doubted
these divine promises
and was deprived
of speech;
but when you were born
he recovered the voice
he had lost.
The heavenly citizens
celebrate you
with lauds, one God
and at once trine;
we also come
imploring forgiveness;
spare us among the redeemed.
Still trapped
in your mother's bosom,
you felt the King's presence
in the maternal womb.
And prophet even before birth,
this mystery you revealed
to your parents.
Glory be to the Father
and to the begotten Son;
glory as well
to you, the Holy Spirit,
worthy companion of theirs,
one God,
for now and ever. Amen
Latin text
English translation