Klezmer is Yiddish music, the music of the Jews of Europe and America, a music of laughter and tears, of weddings and festivals, of dancing and prayer. Born in the Middle Ages, it came of age in the shtetl (the Eastern European Jewish country town), where "a wedding without klezmer is worse than a funeral without tears." Most of the European klezmorim (klezmer players) were murdered in the Holocaust; in the last 25 years, however, klezmer has been...