Christmas
Hymn 42.
O come, all ye faithful
¶Choose your part under Play voice to hear it alone, or let all four sound and sing yours. Concert key moves the whole hymn up or down to suit your voice.
Opening the music…
The Words
1O come, all ye faithful,
Joyful and triumphant;
O come ye, O come ye, to Bethlehem;
Come and behold Him
Born, the King of Angels;
O come, let us adore Him,
O come, let us adore Him,
O come, let us adore Him, Christ the Lord.
2God of God,
Light of Light,
Lo! He abhors not the Virgin's womb;
Very God,
Begotten, not created;
O come, let us adore Him, &c.
3Sing, choirs of angels,
Sing in exultation,
Sing, all ye citizens of heaven above,
Glory to God
In the highest;
O come, let us adore Him, &c.
4Yea, Lord, we greet Thee,
Born this happy morning;
Jesu, to Thee be glory given;
Word of the Father,
Now in flesh appearing;
O come, let us adore Him,
O come, let us adore Him,
O come, let us adore Him, Christ the Lord. Amen.
The Page It Came From

Where It Comes From
Read note by note from Hymns Ancient and Modern (Novello, London, 1861), and checked against the printed page. See that page in the scan of the book at the Internet Archive: open the page page 2.
First published in London in 1861. Every tune, harmony and text in it was printed by 1861, so all its writers died long before 1966, and the book is out of copyright in India and the USA.