Vince Gill and Keb' Mo' have been added to the lineup of a guitar festival taking place Saturday (May 1) in Leipers Fork, Tenn., a small community located south of Nashville. Set to run from 11 a.m. to 6 p.m., GuitarFest: A Six-String Celebration will include performances by several world-class guitarists and exhibits of historic instruments built by the Martin, Fender, Gibson and Gretsch companies. Among the guitars are a 1958 Gibson Explorer previously owned by Eric Clapton and an acoustic guitar built for Johnny Cash by famed guitar builder Danny Ferrington. Larry Carlton, who has played on recordings by Barbra Streisand, Steely Dan, John Lennon and many others, will kick off the concert at 2 p.m. He'll be joined onstage by Robben Ford. Other performers will include Rick Vito, Texas blues legend Bugs Henderson and session greats Brent Mason, Reggie Young and Al Perkins. Admission is free, but donations will be accepted for Save the Franklin Theatre, a campaign to restore the historic movie theater in nearby Franklin, Tenn.