The O Antiphons are traditionally sung in the last seven days of Advent from December 17th until Christmas Eve.
Below are reflections on each O antiphon, a post for each day.
Click on the links below.
"O Wisdom", The First of The O Antiphons from here.
My post in August this year also reflected on the feminine mystery of God-Hagia Sophia (Holy Wisdom) from here.
"O Adonai", Second Antiphon from here
"O Root Of Jesse" Third Antiphon from here
"O Key of David " Fourth Antiphon from here
" O Rising Sun " Fifth Antiphon from here
" O King Of Nations Sixth Antiphon from here