Eddie Vedder has made a song from his score to the Robert F. Kennedy documentary, Return to Mount Kennedy, available to raise money for a charity.

Two versions of the piece, titled “Cartography,” are being issued by the Sub Pop Singles Club — Vedder’s original and a remix by Yeah Yeah Yeahs guitarist Nick Zinner. Proceeds from the record sales will go to Fair Fight, a non-profit that fights voter suppression.

You can hear both versions on YouTube. The original is audio-only, while there Zinner’s remix accompanies scenes from the film.