Which was the Son of ....
Cantus in Memory of Benjamin Britten
Te Deum for chorus and orchestra
My favorite was Which was the Son of... I couldn't find a video of the University Singers doing it, so I'm embedding this one instead:
4/1/2009: Thanks to The Daughter who sent me a link to this short film showing Arvo Part offering his "guidance to the Voices of Europe youth choir in Iceland during the rehearsals of his composition "Which was the son..."."
part 2, part 3