KONGOS released its debut album, "Lunatic," in 2012 and made a pretty significant splash in South Africa, the band's homeland, but waited until October 2013 to release it in the U.S. Americans were quick to catch on, and now virtually every alt-rock radio station has the tracks "I'm Only Joking" or "Come with Me Now" on constant stand-by. It's easy to see the popularity: KONGOS is immediately accessible, but carries so much below the surface. Four brothers of Greek descent, sons of the singer-songwriter John Kongos, raised in South Africa and London, got together to play lively folk-pop that incorporates a world of influences. Pounding African drums, an accordion that calls to mind Eastern Europe, an American rootsy guitar, packaged up with main-stage rock star swagger. You get a taste on the radio, but immediately want to know more.