Eugene Volokh tells of a lullaby remembered from his childhood that has more lyrics than he remembered.
I sang for a couple of years in BYU’s Russian Choir. (My Russian was not that good. Neither was my singing. But I could sing in Russian better than the average student.)
The choir director said that Russian folk songs were either about war, the Volga River, or both.
I guess the additional lyrics of that lullaby help to prove that point.