» Tue Jun 12, 2012 4:51 pm
The choir part is amalgamated into the music,and vice-versa.
If you separate the two themes you'll have two different parts of the same music,and the choir on its own will sound perhaps a bit harsh.
Re-arranging the whole theme for choir only would be a different matter of course,and isn't easy.
But only the composer would have the right to do eventually such a thing (or authorize others )