Taken from HowStuffWorks.com:
"Today, many caroling groups sing for charity in churches and neighborhoods; some historical accounts claim this is rooted in feudal societies, when poor citizens would "sing for their supper" in exchange for food or drink.
Another theory is that carolers traveled door-to-door because they were not originally allowed to perform in churches.
Others say this idea didn't develop until the 16th century, when Anglo-Saxon peasants adapted these pagan customs when they went wassailing, requesting nourishment from their superiors in exchange for singing good tidings.
Wassail was a thick, hot spiced beverage that helped keep the traveling well-wishers warm; in its heyday, the drink was just as much of a holiday tradition as eggnog is in modern times. As wassailing evolved, with children often going door-to-door, it became more associated with Christmas and caroling."
The group that walks through the streets in the neighborhood singing Christmas carols is typically referred to as a "caroling group" or a "Christmas carolers." This tradition dates back to medieval times when groups of singers would go door-to-door spreading holiday cheer. Caroling is a popular activity during the Christmas season and is often done by church groups, community organizations, or simply a group of friends or family members.
Carolers.
Carolers are a group of people who usually go door to door to sing songs. They usually go around singing songs of praise or joy. You'll likely see carolers out during the winter near Christmas singing Christmas songs.
No, it is the present participle of "to sing" and may be a verb, noun (gerund), or adjective (e.g. singing carolers).
Because the guys singing is strange and awkward. They are singing nicely then when he chimes in it is not so good.
The carolers were initially startled and nervous when Hamadi approached them, but they quickly realized that he was friendly and eager to join in singing Christmas carols. They were happy to have him participate and welcomed him into their group with open arms.
Like many other Christmas traditions, caroling is also thought to have its roots in the pre-Christian celebration of the Festival of Yule, when Northern Europeans would come together to sing and dance to honor the Winter Solstice.
Christmas carolers often enjoy singing songs such as Silver Bells, Silent Night, Deck the Halls, Frosty the Snowman, Holly Jolly Christmas, and Jingle Bells.
Victorian Christmas carolers played a significant role in spreading holiday cheer during the 19th century by singing traditional Christmas songs in public spaces, bringing joy and festive spirit to communities.
The Merry Christmas song was first sung and performed in the 16th century in England. It was traditionally sung on Christmas Eve as carolers were out and about singing.
The Carolers - 2009 was released on: USA: 11 August 2009 (internet)
In the Western countries, people go in groups from door to door and sing songs on your front door step on Christmas Eve. These people are called Christmas Carolers