Praxis, the intriguing collaboration between Bill Laswell, Buckethead, Brain, Bernie Worrell and DJ Disk is one of the latest additions to the Bonnaroo line-up. Also confirmed to perform is Robert Earl Keen, Addison Groove Project, Xavier Rudd (who sat in with String Cheese Incident over the weekend in Australia) and Antigone Rising. With an increased audience capacity, tickets are still available for the festival which is set to take place in Manchester, TN on June 11-13.