I will be there first to admit I don't like it when people mess with our national anthem's arrangement but I have to say just singing it in a minor key is hauntingly beautiful. Starts at 25 seconds.
Wow. I have to give credit to the guy, as I'm not sure I could do that myself. Singing a song in a minor key that's normally sung in a major key (and vice-versa) is extremely difficult to do in my experience.