This is just announced for Friday latenight. Oh well, looks like I am going to miss the Def Jux crew:

Bonnaroo continues an annual tradition with an all-star SuperJam, starting at midnight on Friday, June 15. Former Led Zeppelin bass player JOHN PAUL JONES will anchor a trio featuring one of music's most innovative modern bluesmen, guitar wizard BEN HARPER, and Roots drummer AHMIR "?UESTLOVE" THOMPSON. The SuperJam is one of the most highly anticipated features of the festival, combining the talents of a diverse set of musicians for a one-time-only collaborative performance. Past participants have included Stewart Copeland, Herbie Hancock, Dr. John, Trey Anastasio, and many other musicians of the highest caliber - and if history is any indication, expect special guests to join the fun.

Since the break-up of Led Zeppelin in 1980, Rock and Roll Hall of Famer Jones has worked with bands including R.E.M. and the Foo Fighters. Harper's last album, "Both Sides of the Gun," debuted at Number Seven on the Billboard charts; Rolling Stone has called him a "natural-born superstar." In addition to his role as the heartbeat of hip-hop trailblazers the Roots, Thompson has played with and produced such artists as D'Angelo and Fiona Apple; at Bonnaroo, he will also be performing with his jazz-oriented group, The Philadelphia Experiment.