MR

Never was impressed with nor did I have the patience for those so-called "beat-boxers". Other than singing, there aren't many other sounds that come out of the human body that anyone could really call.... "good"??
However....
Naturally 7 has taken beat-boxing to an entirely different and impressive level by "boxing" the instruments of an entire band and providing harmonized vocals at the same time. They've done several songs. Some their own and some covers and of the half dozen videos I've watched so far, all of them are sensational. Here's one of their own:
http://www.youtube.com/watch?v=JNJlhtNpuiU
Another worth checking out is their cover of "In the air tonight".
http://www.youtube.com/watch?v=T5qc3qZqe38