This was the last of this summer's WTMD's First Thursday concerts. The middle set was given to Hamilton Leithauser, who formerly led the D.C.-launched Walkmen. Showcasing the songs from his new solo debut, "Black Hours," the tall, slender blond took the role of a Sinatra-like saloon singer, his handsome tenor seasoned with a melancholy rasp and backed by a tightly focused pop-rock band. The lyrics didn't impress, but the melodies and chord changes were ambitious enough to stand out from most of the alternative pop that WTMD plays. Leithauser announced from the stage that his current guitarist and fellow ex-Walkman, Paul Maroon, had just moved to Baltimore.