Without a doubt, it has to be the Free Software song. Old original recording: https://www.gnu.org/music/free-software-song.ogg https://www.gnu.org/music/free-s

Without a doubt, it has to be the Free Software song. Old original recording: https://www.gnu.org/music/free-software-song.ogg https://www.gnu.org/music/free-software-song.ogg More performances and lyrics: https://www.gnu.org/music/free-software-song.en.html https://www.gnu.org/music/free-software-song.en.html