Yes that is John Oates (of Hall and Oates fame) playing to a hall full of geeks, flacks and VCers. But he wasn’t a random celebrity shill. He was actually doing something useful—showing the audience how to play his classic song “She’s Gone,” (see a video here) as he does on an instructional video download from tech startup iVideosongs. The Web service is one of 77 debut companies, each given six minutes onstage to explain their technology--and how they’ll make money with it.