I'm not sure what the relationship is between an A Capella group and entrepreneurs is... But I can tell you why the cops showed up.<p>SXSW the brand is very powerful - if you are an artist, being able to say that you performed at SXSW means that you'll be able to book better/larger venues, and perhaps get a better deal with a record company.<p>As a result, there are several artists who show up each year and stage ad-hoc performances like the ones who played while being driven around on a trailer. They don't pay venue fees (a source of revenue for Austin), and are now say "We're cool - we played at SXSW". In other words, glomming onto the brand that SXSW has worked to create.<p>Austin PD will shut down unauthorized performances for this reason, as well as general crowd control & liability reasons. It's not because SXSW has become this big evil corporation - they're good people. But now that they're the size they are, they have to do certain things.<p>You'll see the same things happen at Fun Fun Fun Fest this fall, and for the same reasons.<p>OK, back to early-stage entrepreneurs. I got to (over)hear about a dozen elevator pitches, and it's still very much a happening scene. Compared to last year, I didn't hear the word "coupon" nearly as much. :)