Sarah sez, "BBC radio is doing a piece about the influence of Yiddish on American culture - they have a great clip describing the ways in which Yiddish songs made their way into jazz...
Yiddish - a language once spoken by more than 10 million Jews - had a profound effect on American culture in the first half of the 20th Century.
It originated in central and eastern Europe - and spread to the United States when thousand of immigrants arrived in New York.
Zalmen Mlotek is the Artistic Director of the city's last surviving professional Yiddish theatre - the Folksbiene.
With the help of his piano, he has been telling Radio 3's Dennis Marks how the language influenced jazz music - and the likes of George and Ira Gershwin.