24 folk songs so far on Zeit Online (including Plattdeutsch)

Zeit Online now has a total of 24 folk songs here including lyrics and music score that are highly recommended for German students. The most recent one (#24) is in Plattdeutsch (Low German) so you can even get a bit of exposure to that if you want. The one I know the best (because it was one of the songs in a German textbook I bought a few years back) is die Gedanken sind frei (Thoughts are free - pdf here), a particularly interesting song because it was banned for a while too. Lyrics like this simply weren't acceptable during Nazi Deutschland:

3. Und sperrt man mich ein
im finsteren Kerker,
das alles sind rein
vergebliche Werke.
Denn meine Gedanken
zerreißen die Schranken
und Mauern entzwei:
Die Gedanken sind frei!

Basically: you can put me in the darkest dungeon but it's a waste of effort, because my thoughts are free and can tear walls in two and go wherever they want. So there.

I probably won't get around to listening to all 24, so any recommendations so I won't miss a particularly good one?

Edit: Verstohlen geht der Mond auf is pretty good too (just listened to it for the first time).
Edit 2: a better way (i.e. non-choppy way) to listen to the song is this link - click on the download link just below and to the right of the media player bar, and the song starts at 5:20.