Incredibox is virtual beat-box flash app made by three French artists.

You basically drag different symbols onto a person’s (polo) shirt, and they begin to beatbox a certain instrument or melody.  Once you drag a symbol onto one of the beatboxers, a new one will appear next to it, ready for another sound.

Check it out at incredibox.fr

you can hear more from the beatbox artist, The Incredible Polo via his myspace page.