I recognised DAT DU MYN SCHATSKEN BIST posted by Alan in 1998 as a song I was familiar with via the singing of Hannes Vader. He recorded an album of songs in Plattdeutsch and calls the song Dat du min Leefste büst (mainly a difference in spelling, and I thing Schatsken and Leefste have similar meanings, something like "darling")
https://www.youtube.com/watch?v=5EhdGVokcSE