This hymn, performed by the band Árstíðir in the echoing chambers of a train station is truly beautiful (I found it via this tweet). I looked in the comments on Youtube and found out the lyrics of this 800 year old hymn:

Hear creator of the heavens
what the poet begs.
Come softly to me
your mercy.
I trust in you,
you have created me.
I am your servant
you are my lord.

God, I trust in you
to heal me.
For the least, my king,
we need you the most.
Take, my God,
so powerful and inquisitive,
the sorrow out of our hearts.

My king, watch over me,
we need you the most.
For every moment
to hold ground.
Set the son of a maiden,
a beautiful matter.
All the help from you
in my heart.

This is written in a very violent time in the Sturlunga-age in Iceland. A few families were having disagreements over power and the man who wrote this poem was a member of one of those families. He was in the Ásbirninga family and his name was Kolbeinn Tumason. It is said that he wrote this just prior to “Víðinesbardagi”, a battle in 1208. He said this poem over and over, so often that the people around him memorized it.