MOUNTAIN JAM by The Allman Brothers. "Mountain Jam" is an improvised instrumental jam by The Allman Brothers Band. The song's first known recording is on May 4, 1969 at Macon Central Park. "Mountain Jam" was originally released on the 1972 Eat a Peach album, as recorded at the Fillmore East concert hall, in March 1971. That is the rendition that is best known.