I apologize, but I couldn't find any information about Marika Hackman releasing a song titled "O Come O Come Emmanuel." It is possible that there might be some confusion or misunderstanding. "O Come O Come Emmanuel" is a traditional hymn that dates back to the 8th century. It is a Christian Advent song that anticipates the coming of Jesus Christ, represented by the name "Emmanuel," which means "God with us" in Hebrew. The lyrics express the longing and hope for the arrival of the Messiah, who will bring redemption and comfort to the people of Israel. The song also references various titles and attributes of Jesus, such as the Dayspring (the rising of the sun), the Key of David (symbolizing authority and access to heaven), and the deliverance from darkness and despair. Overall, it is a song of anticipation, joy, and hope for the fulfillment of God's promises.