Najpiekniejsze Kolysanki Swiata cz. 2 by various artistsstreamed via RoonI found this by doing a Roon search for all the different versions of the Elisabeth Serenade. This version was well recorded and I then found this album. These are classic, beautifully melodic tunes. I’m guessing the language is Polish. If not, then maybe Czech.https://www.amazon.com/Najpi%C4%99kniejsze-Kolysanki-%C5%9Awiata-cz-2/dp/B00FJCK8EW/ref=sr_1_2?keywords=Najpiekniejsze+Kolysanki&qid=1580624445&sr=8-2