Take a quick glance at the high concept behind the band Gangstagrass — bluegrass meets rap — and the first word that may come to mind is “novelty.” But when you actually listen to group’s music, it becomes evident that members Rench, Dan Whitener, Landry McMeans, R-Son The Voice of Reason and Dolio The Sleuth are creating material that is anything but throwaway. Their sound succeeds by blending the best elements of hip-hop and string music — and by showing the sonic link between the genres … which shouldn’t be a surprise since both are from the African-American musical experience. Catch them live in the ATL on May 2. $12-$15. 8 p.m. City Winery, 650 North Avenue, Ponce City Market. http://www.citywinery.com.