Here We Come A-Wassailing (arr. cj renzi): “Wassailing songs are among the most popular of the secular holiday songs of Christmas. Among the most popular of wassailing songs begins:

Here we come a wassailing Among the leaves so green, Here we come a wandering So fair to be seen.

The Wassail Song is among the best known of the traditional wassail songs, and was well-known throughout England by the middle 19th century. It's roots, however, certainly go back even further.

Rev. Ian Bradley makes the excellent point that the tradition of wassailers going door to door, singing and drinking to the health of those whom they visit, goes back to pre-Christian fertility rites where the villagers went through orchards at mid-winter singing and shouting loudly to drive out evil spirits, and pouring cider on the roots of trees to encourage fertility.” by hymnsandcarolsofchristmas.com