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 Dobson, known for a soulful, organic style of R&B, opens. Friday, July 1, at 7:30 p.m. The Birchmere, 3701 Mt. Vernon Ave., Alexandria. Tickets are $29.50. Call 703-549-7500 or visit birchmere.com.