The human voice is the most sublime instrument.
http://jp.youtube.com/watch?v=MpxRMxBTjWw
http://jp.youtube.com/watch?v=GI5Ac5D3IZE&feature=related
http://jp.youtube.com/watch?v=9K2EA8SWhh8
http://jp.youtube.com/watch?v=jZL3POaATn8
http://jp.youtube.com/watch?v=PYPSZiE0OAs
