TED LEO is one of the most vital post-hardcore songwriters working today. Unlike deliberately pop-oriented punk acts such as Green Day, the D.C. songwriter is a throwback, valuing authenticity and political forthrightness over artifice and subtlety. His new album with his band the Pharmacists, Living with the Living, is the latest in a series of solid, impassioned records. Australian post-punk trio Love of Diagrams opens the Sat., MARCH 31, show. $15. 8:30 p.m. Variety Playhouse, 1099 Euclid Ave. 404-524-7354. www.variety-playhouse.com.