TubeNet

If you are a young player, I would focus more on the fundamentals of getting a nice sustained sound to come out of my horn.

That's my 4,000 Vietnamese Dong worth.

Stick with the tried and true. Experiments scare me.

Back in the 80's the human beatbox was the stuff. The "Fat Boys" featuring the late Darren Robinson aka "Buff" were one of the first and best at it. Stick 'em and The Human Beatbox were two of their classics, and are a must-hear for any beatboxer. Listening to Buff free buzz "My Country Tis of Thee" makes me think he would have been an incredible tuba player. The link below has audio samples of these pieces and other classic beatboxing works. Also, if you ever come across their movie, Disorderlies, it is well worth watching for the amount of stupid antics in it!
http://thebox2.free.fr/beatbox.html

Damn... I must be out of touch... Had to look up 'beatboxing'

There is a thread on this with additional comments at our neighbors, Brass-forum.co.uk