"Bayou Soul" is the descriptor for Louisiana singer-songwriter Marc Broussard's music, a gumbo of funk, swampy blues, R&B, even church hymns. If you've ever watched the NBC series Medium, you've at least heard a snippet of his song "Home," used for the show's theme. Broussard, the son of acclaimed Louisiana guitarist Ted, stops at the 9:30 Club in support of his latest album on Atlantic Records. Friday, July 15. Doors at 8 p.m. Nightclub 9:30, 815 V St. NW. Tickets are $25. Call 202-265-0930 or visit 930.com.