Choral Score for Arvo Pärt Te Deum.  Study score also available for purchase.  Full score and instrumental parts are rental only.

The liturgical text of the Te Deum consists of immutable truths. I am reminded of the sense of immeasurable serenity imparted by a mountain panorama. Swiss artist Martin Ruf once told me that he can distinguish over twenty shades of blue in the mountains when the air is clear. His words immediately turned into sound; I began to hear
those blue mountains. I wished only to convey a mood, a mood that could be infinite in time, by delicately removing one piece - one particle of time - out of the flow of infinity. I had to draw this music gently out of silence and emptiness. The work Te Deum was a quest for something evanescent, something long lost or not yet found, the quest for something believed to be non-existent, but so real that it exists not only within us but beyond our being as well.
(Arvo Pärt)