Over thousands of years of Jewish migration, communities have developed distinctive musical styles. The Yamma Ensemble, Israel’s foremost world music group, performs both ancient and modern Hebrew music from throughout the Jewish diaspora. The group makes its Athens debut on Sept. 22 at 7:30 p.m. at the Hugh Hodgson Concert Hall. A pre-concert talk begins at 6:45 p.m. Tickets start at just $25, and UGA student tickets are only $10. “So, what is the secret of Yamma that catches so easily the ear of thousands of listeners all over the globe?” the ensemble’s website asks. The music is rare, esoteric,...