A Solis Ortus Cárdine, the Lauds Hymn for Christmas, penned by the 5th century wordsmith, Sedulius, is the beginning of an abecedarius, a poem where each stanza begins with a letter of the alphabet, that tells the life of Christ from his birth to his Resurrection.
Below is a new setting of the first four stanzas of the text with the refrain from John's Gospel, "And the Word was made flesh and dwelt among us." O Magnum Mysterium!
A translation of the Latin text and the score can be found here.
Thank you for listening. ~nl