Pepsi and Billboard have teamed up with Katy Perry for the launch of their "Summer Beats" series, which will kick off with a live performance by Perry at an LA location that has yet to be announced.  The concert will take place on June 26th, and will be streamed over the Internet via Twitter.  For Perry, the concert will be a perfect opportunity to promote her upcoming 3D biopic "Katy Perry: Part of Me," which opens in theaters July 5th.  Pepsi and Billboard, meanwhile, will continue the Summer Beats series with a Nashville show in late July and one in New York in late August.  Performers for those shows have yet to be determined.