Pudcat,
The song you are looking for is "Vilja O Vilja", it's a Balkan melody, and the song comes from the Operetta, "The Merry Widow", production of 1934. It was originally written in 1907. The words were written by Ross and Lehar for the 1934 production of "The Merry Widow". Much later it was adapted by Artie Shaw in a much more swinging style, and was generally sung in English as "Delia O Delia". It was often sung in the Ross Lehar version at choral concerts in the 1940's and 50s. It is possible to buy a copy of the lyrics from some Sheet Music sites on the Internet. Hope this helps. By the way it is a beautiful tune.