Just two months ago, the Philadelphia-area singer-songwriter Eric Roberson performed on a double-bill with Vivian Green at the Birchmere under the title "Soul Survivors." Now he returns for a solo set, focused strictly on his career. Roberson, a Howard University alum, has collaborated with DJ Jazzy Jeff and Jill Scott in addition to solo work. Jamaican-born, New York-based singer-songwriter Abby ... [Read]