"Free-to-use" means the words can be copied and sung to at least one tune with no concerns about copyright or performance licensing. Many such hymns are old/traditional - but where possible a variety of styles / genres are included.
Seasonal NoteIn some countries, the bishops have decided to observe the feast of Epiphany on Sunday, and it replaces this day. Check with your local liturgical calendar to see what is happening in your country.
Also, most communities have a familiar repertoire of public domain Christmas music, so choosing free-to-use hymns for this season is simple. The list below doesn't include all well known Christmas carols, just ones that are a particularly good fit with the lectionary themes for this day.
lectionary art for this Sunday for suggested pictures and art-works based on today's readings.
Psalm: Psalm 147 - The Word was made flesh and lived among us / O praise the Lord Jerusalem / He established peace on your borders / He makes he word known to Jacob
Second: Ephesians - Before the world was made, God chose us to be his children.
Gospel: John - In the beginning was the word ... John came, sent by God as a witness for the light ... no one has even seen God, only the Son who is nearest the Father's heart .
ThemesThe incarnate Christ, come to live on earth. Christ - son of God and Word of God. We are God's children.
Possible hymnsAs with Gladness Men of Old
Father and Life-giver
Go Tell it on the Mountain
Let all Mortal Flesh Keep Silence
Little Jesus Sweetly Sleep
Love Came Down at Christmas
Mary Had a Baby, Yes Lord
Of the Father's Love Begotten
What Child is This
Suggestions about other free-to-use hymns that could be included are welcome: either leave a comment below.