I can think of no better way to wish you all the blessings of this Holy Day than to share a video, which you have probably already seen because it's been viewed almost 27 million times. A flash mob descended upon a food court in a mall in Canada to share a bit of Handel's Messiah with the shoppers.
The Messiah was first performed in London before King George II. The king stood during the Hallelujah Chorus--either in tribute to the Lord of All or in tribute to Handel. Since then, the tradition has been to stand during that chorus.
Wishing you the joy of this Season.