The violin is considered one of the most difficult instruments in the world, but ANDREW BIRD makes it look easy. His style is unconventional, and his music is unique, mixing classical, Eastern European folk music and a little hillbilly blues to make something completely new. Aussie pop band Augie March opens the Thurs., SEPT. 13 show. $20. 8:30 p.m. Variety Playhouse, 1099 Euclid Ave. 404-524-7354. www.variety-playhouse.com.