http://www.youtube.com/watch?v=rDB9zwlXrB8
The semifinal performance of Paul Potts. I felt this performance was technically better than the first, and the crowd (knowing what to expect this time!) loved it again. This guy does have sort of an unexplainable appeal (in addition to being quite talented).
Con te partiro is another solid choice that is sure to wow most crowds. I would love to see this guy win that show (and based on audience and judge reactions, he probably will easily). I wish we could get something like this on America's Got Talent. That show is like a parade of freaks most times I watch it.