This song package is composed from files from publicly available sources.

The music is available at:

  http://www.gnu.org/music/free-software-song.html

The cover:

  "A handsome GNU Head with typical beard and smart-looking curled
  horns. He or she appears to be smiling contentedly with its works as
  of yet, but it still gazes off into the distance."

  http://www.gnu.org/graphics/agnuhead.html

The backdrop:

  "A picture of the Dynamic Duo: the Gnu and the Penguin in flight."

  http://www.gnu.org/graphics/bwcartoon.html
  http://www.gnu.org/graphics/gnu-and-penguin-color-original.xcf