With a prolonged stint in Them Damn Kids on his resume, Chris Darby’s initial solo effort, Road Songs, is a concise, four-song EP of varied acoustic folk. There’s a hint of Celtic melody in “Thursday’s Child,” and American bluegrass peeks through the dusty, windswept “Night To Night.” The instrumentation lends a soft, cottony weight to these songs — a warbling bass rumbles with patient authority as harmonica and a gracefully plucked guitar line skips in lilting counterpoint in “Road Song.