So my wife and I went to the Porcupine Tree concert last night and That 1 Guy was opening. After about him I was getting pretty excited to see him play. He's a classically trained double bass player who attended the San Francisco Conservatory of Music. He invented his own crazy instruments and performs as a one-man band of sorts. We arrived about 15 minutes before the concert start time, but it seems he had already begun playing a while ago. We only got to see him for about 15 - 20 minutes but it was still really awesome.
Check out his page which has one video on it: http://that1guy.com/
He'll be back in Seattle on November 28th which I'm bummed about because I won't be able to make it.
Also, please so he gets more exposure.