A fanlisting is a place for all fans of a particular show, movie, actor/actress, singer, etc. to come together and build the biggest listing of people from all around the world who are fans of that subject.
(from TheFanlistings.org)

This particular fanlisting is for fans of the BGM song Countdown from the anime series ef - a tale of memories. If you are a fan, then why don't you just join us?