Warren Haynes fourth annual Mountain Jam Music Festival has added two additional artists. Ray LaMontagne and Ingrid Michaelson also will appear at the event, which will take place at New Yorks Hunter Mountain from May 30- June 1. The line-up now features the host’s Gov’t Mule along with Bob Weir & RatDog, Umphrey’s McGee, Michael Franti & Spearhead, Medeski, Scofield, Martin & Wood, Citizen Cope, Drive-By Truckers, Dr. Dog, Dark Star Orchestra, Ivan Nevilles Dumpstaphunk, Galactic, Grace Potter & the Nocturnals, Sharon Jones & the Dap-Kings, JJ Grey & Mofro, The Greencards, Jim Weider, The Felice Brothers, Jackie Greene, Pnuma Trio, and Lotus. This year Mountain Jam also will host outdoor late night performances by artists such as Galactic and the Dark Star Orchestra on Friday and Saturday nights. Meanwhile the tradition will continue of indoor late night performances from the Hunter Mountain Lodge, with Lotus and the Pnuma Trio set to appear. Mountain Jam passes are now on sale.