"O Little Town of Bethlehem" is a Christmas carol. Based on an 1868 text written by Phillips Brooks, the carol is popular on both sides of the Atlantic, but to different tunes: in North America to "St. Louis" by Brooks' collaborator, Lewis Redner; and in the United Kingdom and Ireland to "Forest Green", a tune collected by Ralph Vaughan Williams and first published in the 1906 English Hymnal.
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