an artistic expression of the Catholic spiritual and intellectual tradition is so readily evident that the Irish musicologist William H. Grattan Flood concluded that the words and music of the song “are to be attributed to a Catholic source and for Catholic worship”. Performance In performance, verses are often omitted – either because the hymn is too long in its entirety or because the words are unsuitable for the day on which they are sung. For example, the eighth anonymous verse is only sung on Epiphany, if at all; while the last verse of the original is normally reserved for Christmas Midnight Mass, Mass at Dawn or Mass during the Day. In the United Kingdom and United States it is often sung today in an arrangement by Sir David Willcocks, which was originally published in 1961 by Oxford University Press in the first book in the Carols for Choirs series. This arrangement makes use of the basic harmonisation from The English Hymnal but adds a soprano descant in verse six (verse three in the original) with its reharmonised organ accompaniment, and a last verse harmonisation in verse seven (verse four in the original), which is sung in unison. This carol has served as the penultimate hymn sung at the Festival of Nine Lessons and Carols by the Choir of King's College, Cambridge, after the last lesson from Chapter 1 of the Gospel of John. Adeste Fideles is traditionally the final anthem during Midnight Mass at St. Peter's Basilica in the Vatican. See also List of Christmas carols References External links Free sheet music of "O Come, All ye Faithful" for SATB from Cantorion.org Adeste Fideles, two 19th-century arrangements Original Latin, English translation, historical notes , sung to David Willcocks' arrangement by the Georgia Boy Choir Christmas carols Catholic music English Christian hymns Hymn tunes Songs about Jesus 18th-century hymns in Latin Charles Edward Stuart Jacobite songs Hymns in The English Hymnal Latin Christmas carols