A previously unreleased R.E.M. song, "Until the Day Is Done," will premiere tomorrow (Oct. 10) on CNN's "Anderson Cooper 360." The song is synced to clips from the CNN special "Planet in Peril," which airs Oct. 23-24.

"Until the Day Is Done" will also be included in the "AC360" podcast, which goes live Thursday, and in a video trailer for "Planet in Peril" on CNN.com. It is not yet known if it will appear on R.E.M.'s next album, due in the spring via Warner Bros.

The song was played live several times this summer during a run of shows in Dublin. With its acoustic guitar melody and mid-tempo pace, the track recalls prior R.E.M. songs such as "Swan Swan H" or "Drive."

This is not the first time R.E.M. has utilized Cooper's show to unveil new music. In 2002, the group debuted the video for new song "Bad Day" on the program.