Radio Woodstock and Warren Haynes have announced some additions to the third annual Mountain Jam Music Festival. New artists slated to appear at the three day event are G. Love & Special Sauce, Earl Greyhound, Papa Mali and Assembly of Dust. In addition, the festival will host a ‘Join The Jam,’ competition which will allow the winning artist to open the final day of Mountain Jam on Sunday June 3, with the full details (including additional prizes) available at www.sonicbids.com/jointhejam. Mountain Jam will take place from June 1-3 at Hunter, NYs Hunter Mountain. In addition to Govt Mule, Umphrey’s McGee, Michael Franti & Spearhead, Robert Randolph and The Family Band, New Orleans Social Club featuring Henry Butler, Ivan Neville, Leo Nocentelli, George Porter Jr. and Raymond Webber, Ozomatli, North Mississippi, Tea Leaf Green, New Monsoon, and Backyard Tire Fire also are slated to appear.