Free Software Song
The Free Software Song is a filk song by Richard M. Stallman about free software. The song is set to the melody of the Bulgarian "Sadi Moma".
A version of this song is also performed by a band during the credits of the documentary Revolution OS. In 1998, Matt Loper recorded a techno version of the song. Jono Bacon also recorded a heavy metal version of the song, and the band Fenster recorded a rhythmic version. In addition, there is a Spanish pop punk version recorded by ALEC, and a Rick Astley mashup, "".
A version is used in the free software karaoke video game Sinatra.