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The 12th century Wexford Carol (lyrics here), performed beautifully by Alison Krauss and accompanied by YoYo Ma
Ding Dong! Merrily on High (lyrics here) and In the Bleak Midwinter (lyrics here), both performed by King's College Choir
French carol circa 1553, Bring a Torch, Jeanette Isabella (lyrics here); musical version by Fernando Ortega
Let all Mortal Flesh Keep Silence is a 4th or 5th c. chant, whose present day text is based on the liturgy of Saint James. Unlike other carols, this one speaks not just of the Incarnation of Christ, but of his anticipated redemption and of his eternal reign. One of my favorite versions is performed simply but beautifully by Fernando Ortega.