Born in the ghettos of Eastern Europe, the rollicking, rousing, and yet melancholy strains of klezmer music, have a uniquely Jewish sound. The wail of clarinets and violins and the buzz of an accordion create whirling, frenetic melodies that are great fun to dance to. This isn’t just a traditional genre of music for weddings and bar mitzvahs—a lot of young people are getting into the act and starting klezmer bands.