Harmonies, human beat box and more - Naturally 7

I caught a re-run of the 2008 royal variety performance on TV last night and was blown away by these guys. Naturally 7. I had to dive over to itunes and get the album.

I have loved human beat box styles since hearing doug e fresh and of course the brilliant sounds on police academy too. However here its a brilliant all human voiced blend of barbershop harmonies, rap, and beat box.
Stunning stuff. The tune is of course an old Phil Collins track, once for us oldies usually, but delivered like this it shows a good song is a good song.
*Update turns out they closed out at the TED conference too ! brilliant news that.