a-pesni is a huge and wonderful site of Russian, Ukrainian, Polish and Belarusian songs of every description – old folklore, war songs, variety, revolutionary songs, army songs, you name it. Songs that have the melodies as well as the words have a little quaver sign by the title, and there are many of those. Google translate is terrible at translating lyrics but it’ll get you round the site well enough if you don’t read Russian.
I don’t often get excited by websites, but this is a real find, the folkloric equivalent of the IMSLP, if you like, for Eastern Europe. Great for those of us always on the look our for new repertoire, and who love folk music like this.