History
The first specifically Christmas hymns that we know of appear in fourth century Rome. Latin hymns such as Veni redemptor gentium, written by Ambrose, Archbishop of Milan, were austere statements of the theological doctrine of the Incarnation in opposition to Arianism. Corde natus ex Parentis (Of the Father's love begotten) by the Spanish poet Prudentius is still sung in some churches today.
In the ninth and tenth centuries, the Christmas "Sequence" or "Prose" was introduced in North European monasteries, developing under Bernard of Clairvaux into a sequence of rhymed stanzas. In the twelfth century the Parisian monk Adam of St. Victor began to derive music from popular songs, introducing something closer to the traditional Christmas carol.
In the thirteenth century, in France, Germany, and particularly, Italy, under the influence of Francis of Asissi a strong tradition of popular Christmas songs in the native language developed. Christmas carols in English first appear in a 1426 work of John Awdlay, a Shropshire chaplain, who lists twenty five "caroles of Cristemas", probably sung by groups of 'wassailers', who went from house to house. The songs we know specifically as carols were originally communal songs sung during celebrations like harvest tide as well as Christmas. It was only later that carols begun to be sung in church, and to be specifically associated with Christmas.
Carols gained in popularity after the Reformation in the countries where Protestant churches gained prominence (as well-known Reformers like Martin Luther authored carols and encouraged their use in worship), this was the consequence of the fact that the Lutheran reformation warmly welcomed music.
Adeste Fidelis (O Come all ye faithful) appears in its current form in the mid 18th century, although the words may have originated in the thirteenth century. The origin of the tune is disputed. The first appearance in print of "God Rest Ye Merry, Gentlemen", "The First Noel", "I Saw Three Ships" and "Hark the Herald Angels Sing" was in Christmas Carols Ancient and Modern (1833) by William B. Sandys. Composers like Arthur Sullivan helped to repopularize the carol, and it is this period that gave rise to such favorites as "Good King Wenceslas" and "It Came upon the Midnight Clear", a New England carol written by Edmund H. Sears and Richard S. Willis.
Today carols are regularly sung at Christian religious services. Some compositions have words which are clearly not of a religious theme, but are often still referred to as "carols". For example, the sixteenth century song "A Bone, God Wot!" appears to be a wassailing song (which is sung during drinking or while requesting ale), but is described in the British Library's Cottonian Collection as a Christmas carol.
It is often difficult to draw a distinction between a Christmas carol and a Christmas song. To be sung by a church choir or sung in the street by amateurs, a song would have to have a fairly rapid, regular beat, which would therefore exclude a meandering crooning song such as "White Christmas". A country music song such as "Blue Christmas" might qualify, but in this case it would have to be adopted by many choirs, over many years to be truly "vernacular", and so far it has failed to gain wide acceptance. The Concise Oxford Dictionary is more generous, as it defines a carol as a "religious song...associated with Christmas". If Christmas Carols are played before December, or after Christmas Day (including on Boxing Day), it is considered to be extremely bad luck in many countries.
It is not clear whether the word carol derives from the French "carole" or the Latin "carula" meaning a circular dance. In any case the dancing seems to have been abandoned quite early Music.
Traditionally, carols have often been based on medieval chord patterns, and it is this that gives them their uniquely characteristic musical sound. Some carols like "Personent hodie", "Good King Wenceslas", and "The Holly and the Ivy" can be traced directly back to the Middle Ages, and are among the oldest musical compositions still regularly sung.
Compositions continue to be written that become popular carols. For example, many of the carols written by Alfred Burt are sung regularly in both sacred and secular settings, and are among the better-known modern Christmas carols.
Church and liturgical use of Christmas carols
Almost all the well known carols were not sung in church until the second half of the 19th century. Hymns Ancient and Modern 1861–1874 included several carols. Isaac Watts, the "father of English hymnody", composed "Joy to the World" which has become a popular Christmas carol even though it is widely believed that Watts did not write it to be sung only at Christmas.
Charles Wesley wrote texts for at least three Christmas carols, of which the best known was originally entitled Hark! How All the Welkin Rings, later edited to Hark! the Herald Angels Sing. In 1840 Felix Mendelssohn wrote a tune in a cantata; William H. Cummings adapted this tune to fit Wesley's words and this combination first appeared in "Hymns Ancient and Modern" in 1861.
Silent Night comes from Austria. The carol was first performed in the Nikolaus-Kirche (Church of St. Nicholas) in Oberndorf, Austria on December 24, 1818. Mohr had composed the words much earlier, in 1816, but on Christmas Eve brought them to Gruber and asked him to compose a melody and guitar accompaniment for the church service. The first English translation was in 1871 where it was published in a Methodist hymnal.
Episodes described in Christmas carols
Several different Christmas episodes, apart from the birth of Jesus itself, are described in Christmas carols, such as:
The Annunciation, for example Gabriel's Message
The Census of Quirinius, a rare subject, but touched on in On a Day When Men Were Counted by Daniel Thambyrajah Niles (1964)