Annraoi,
d'accord - you're right speaking about bilingual or polyglottal poetry. I was speaking about language structure and patterns.

An Pluiméir Ceolmhar,
you're not alone with fascination by Yiddish. In Goethe's autobiography we find that he learned Hebrew at school to understand Yiddish better.
S. Landmann in "Der jüdische Witz" refers mostly to the Ostjuden (Poland, Russia, Galicia). Additional to their Hebrew material they brought in the Slavic words into Yiddish, and their language intonation was far away from the Westerner's erudite pronouciation . Between the Jews in the Reich and and the Ostjuden there was a big cultural gap; the German jews felt mostly German first, serving in the army after the emancipation, and were not so happy about the Eastern Jewish immigrants, as I was told.
Especially the Hassidic element might have been considered more than exotic by the Western Jews, mostly graduated by well known universities.

Wilfried