The roster of Jammys performers has expanded once again. New additions to the show include Mike Gordon, Chick Corea and Grace Potter. The three will join a line-up that already includes moe., Blues Traveler, Bela Fleck and the Flecktones, Mickey Hart, Billy Kreutzmann, Peter Frampton, Joe Satriani, Stephen Marley, Ky-Mani Marley, Guster, Savion Glover, Richie Havens, Angelique Kidjo, Steve Kimock, Stephen Perkins, Bettye LaVette, Little Feat, DJ Logic, Mad Professor, Baaba Maal, Martin Sexton, Charlie Musselwhite and McCoy Tyner. Also, Dweezil Zappa will pay tribute to his father, Frank Zappa, who is being posthumously honored with this year’s Lifetime Achievement Award. Voting is underway and tickets are still on-sale, with all the details at Jammys.com .