It is always a pleasure to listen to your works live. I not live they are amazing too, but live is a super-plus.
This piece sounds so familiar... It's funny, I am not an American, but I feel it as a traditional American tune. Of course beatifully harmonised and "counter-pointed".
Writing for vocal is something I'd like to do, but I have to study more. I tried to compose some small pieces for 4 voices, but I always tend to dissonance, even atonality, and don't know if it's OK.
Anyway this is your work and I love it. Thanks, and thanks to the people that sing it.