Sam Amidon w/ Max Gracia Conover at One Longellow Square. Sam Amidon’s third album for Nonesuch, The Following Mountain, is ostensibly his first of self-penned songs. But in his decade-long career as a recording artist, the singer and multi-instrumentalist has always managed to create work that’s utterly original, even when, on previous discs, he was digging through the sounds and stories of traditional American music from the late nineteenth and early twentieth centuries. Accepting invitations to that session, much to Amidon’s delight, were the legendary percussionist Milford Graves; fellow percussionist Juma Sultan; and the young saxophonist Sam Gendel. 8-11pm. $12 advance – $15 day of. FMI: onelongfellowsquare.com.