"O come, o come Emmanuel"

Today marks the start of the season of Advent, and the beginning of a liturgical new year. Veni Emmanuel, typically sung at the beginning of Advent, is a hymn that has always sent shivers down my spine, even though I sometimes do a Spoonerism in the first verse, changing "that mourns in lonely exile" to "that lorns in moanly exile" (which actually sort of makes sense). In the clip above, thanks to Ikje86, it's sung by the choir of St. George's Chapel, Windsor Castle.