This is Greg Patillo, flute beatboxer. I know it sounds ridiculous, but he rocks! He really gets into it at 30 seconds in. You can find him and other flute beatboxers on YouTube - just search for Flute Beatboxing. Actually, chances are you've probably already seen this video - it's had 15.2 million views!
There are some video clips that show him in what looks like Central Park jamming along with a rapper. If I saw them on the streets of New York, I would never get to where I was going because I would stand there and throw coins at them ALL DAY (I'm a fan, but I'm cheap).