St Cecilia, Virgin and Martyr
"At the sound of musical instruments," says the first antiphon at Vespers, "the virgin Cecilia sang to God in her heart." On this account she has been chosen as the patroness of musicians.
Loquebar de testimoniis tuis in conspectu regum, et non confundebar: et meditabar in mandatis tuis, quae dilexi nimis. * Beati immaculati in via, qui ambulant in lege Domini.
I spoke of Thy testimonies before kings, and I was not ashamed: I meditated also on Thy commandments, which I loved. * Blessed are the undefiled in the way: who walk in the law of the Lord.
(Psalm 118:46-47,1 from the Introit of Mass)
Deus, qui nos ánnua beátae Caecíliae Vírginis et Mártyris tuae solemnitáte laetíficas : da, ut, quam venerámur offício, étiam piae conversatiónis sequámur exémplo.
O God who dost gladden us by the annual festival of blessed Cecilia, Thy virgin and martyr: grant that we who revere her with our service, may also follow the example of her pious life.
Vírginis Proles Opiféxque Matris,
Virgo quem gessit, peperítque Virgo:
Vírginis partos cánimus decóra
Son of a Virgin, Maker of thy Mother,
Thou, Rod and Blossom from a Stem unstained,
Thou, King of Virgins, hearken as we honour
(Hymn from Matins)
Catholic Encyclopaedia: http://www.newadvent.org/cathen/03471b.htm