Traditionally, 1st Advent Sunday in Sweden draws more people to church than any other Sunday in the whole year. There are certain hymns which are almost only sung in the month of December, and most of them are of the "grand" kind, like this one:
The lyrics are from the Gospel of Matthew 21:9 - the song the people of Jerusalem sang when Jesus rode into town on a donkey:
Hosanna to the Son of David!
Blessed is he who comes in the name of the Lord!
Hosanna in the highest!
Hosanna is a Hebrew expression meaning "Save!" which became an exclamation of praise.
(Comment in the New International Version of the Bible.)