Chant in Films

I just finished watching "Teresa de Jesus," the series of the life of St. Teresa of Avila made for Spanish television in the 1980s. There was a fair amount of chant. The Te Deum appeared several times, along with the occasional psalm, and it was well done. Not overly polished. It also only appeared as actual source music, not "atmospheric background."

Any other films with good use of chant that come to mind?