It's hard to describe what you're about to hear, other than it's uniquely awesome!
Over ten million hits on Youtube:
http://www.youtube.com/watch?v=yjbpwlqp5Qw&feature=related
Perpetuum Jazzile
Also known as: Gaudeamus Chamber Choir
Origin: Slovenia
Genres: A cappella, Pop, Jazz, Bossa Nova, Funk, Soul
Instruments: singing, beatboxing, scat singing
Website: http://perpetuumjazzile.si/en/