First up is Peter Hollens cover, done entirely with human instruments, that is voice and clapping. The videography is also particularly well-done.
If you search YouTube, you'll find many many more of these covers. Some are bad but a good many are worth the while.
And of course, if you haven't seen the original video then its quite entertaining... at least to me. It's not often you see pop videos with Civil War reenactments.