https://www.youtube.com/watch?v=-y0OS03T_aA

This song was dedicated not to Fredenberg, but indirectly to Peter Fechter. More directly it was aimed at the still reigning dictatorship in Spain in that time, but both contexts work. This is not the older original by Nino Bravo, but a more recent version that was a hit a couple decades ago.

https://lyricstranslate.com/en/libre-free.html