Portland FolkMusic Society presents a lively double bill:  Misty Mamas serves up Home-Style bluegrass filled with powerful harmonies, traditional and original songs as well as tasty instrumentals combining the American genres of bluegrass, old time, gospel, folk and country music. Fadin’ by 9 delivers hot-pickin’, tight harmonies, and a mix of “bluegrassified” rock, folk, and bluegrass covers and originals.