This was scheduled for release as a single on September 11, 2001, the day The World Trade Center was attacked by terrorists. They delayed the release a few days as a result.
Original title was "Bleed." After the events of September 11, radio stations were very skittish about playing anything that could be considered offensive, so they had to change the title to get it played. They renamed it "13" because it is the 13th song on the album.
Aaron Lewis, the lead singer from Staind, sang backup.