Two notable acts, Melt and Sammy Rae & The Friends, headline a concert at the 9:30 Club in Washington, D.C. The venue is a longtime cornerstone of the city’s music scene, renowned for its movable wheeled stage and capacity around 1,200, anchoring the eastern end of the U Street Corridor. The double bill blends rock, electronic, and pop influences for a high-energy night of contemporary indie sounds.