I know I said I wasn't going to post till Monday, but I've been listening, for the first time, to Bach's St. John Passion, and this aria seems perfect for Holy Saturday, containing both the sorrow and the triumph of the Crucifixion. (Regarding the title of the post: I still prefer the traditional "It is finished" to other English versions of those words.)

Es ist vollbracht!
It is accomplished !
O Trost vor die gekränkten Seelen!
What comfort for all suffering souls!
Die Trauernacht
The night of sorrow
Läßt nun die letzte Stunde zählen.
now reaches its final hours.
Der Held aus Juda siegt mit Macht
The hero from Judah triumphs in his might
Und schließt den Kampf.
and brings the strife to an end.
Es ist vollbracht!
It is accomplished!

(Text and translation from www.bach-cantatas.com), which seems to be one of those wonderful group labors of love that are found on the web. It started in 1999 and the web site still looks that way, but don't let that bother you.)

This performance by Christa Ludwig is not from the Passion I've been listening to, which is a more recent one (i.e. 1986!) conducted by John Eliot Gardiner and more in the favored style of recent years, said to be more authentic. But I saw this one on YouTube and I find it more moving. It's almost a full minute longer than the Gardiner version. 

The St. John is not nearly as well-known as the monumental St. Matthew, but it has many, many virtues which I'm happy to have discovered better late than never.