A lot of the Jewish music that I sang while still in Russia and also in my brief two years in Scandinavia on the way to the US, was something that I collected personally from older Jews. There was no sheet music for Jewish music available at the time and so we collected what we could from old records and people's recollections. This brings up funny stories about old Jewish guys interpreting the words of the songs to us and improving on the way adding their own versions.
But these songs were my treasures that I brought to America so that I could sing them here. I had them all in a binder together with all the posters from the concerts that I had.