Romanian composer George Enescu is endlessly fascinating, straddling the line between Romanticism and Modernism. He is probably the greatest composer to ever spring from Romania, and much of his work is of nationalistic origin (particularly his ever-wonderful Romanian Rhapsodies, which are favorites. This piece, though, is pure Modernism through and through, with meditative passages and sharp dissonances and a pervading sense of mystery. Enescu wrote Vox Maris over more than twenty years, and apparently he did not live to hear its first performance. I haven't been able to find a great deal of information about it, but it is indeed a fascinating listen and an amazing piece of orchestral and choral tone painting.
Here is Vox Maris by George Enescu.