Yiddish
Top 4 Must Own
Khevrisa: European Klezmer Music
Budowitz: Khasene on a Kale (Wedding Without a Bride)
Elie Rosenblatt & Pete Rushefsky: Tsimbl un Fidl - Klezmer Music for Hammered Dulcimer & Violin
Joseph Moskowitz: The Art of the Cymbalom - The Music of Joseph Moskowitz, 1916-1953 (not entirely Jewish music - he plays in many other styles as well)
and don't miss these
Chicago Klezmer Ensemble: Sweet Home Bukovina
Budowitz: Mother Tongue
Not Yiddish but Superb as well
Alexander Fedoriouk: Cimbalom Traditions