"One Bird" (2007)
“One Bird” is likely an early name for “Unknown Caller” which was released on No Line on the Horizon in 2009.
In an interview with the Moroccan newspaper, TelQuel in June 2007, Bono discussed the new album that U2 has been working on from the studio in Fez, in Morocco. In the article, published in French, some of the songs noted on the white board in the studio are mentioned by name. Bono explained that ten songs were born during the session in Fez. Of the ten songs, only two of them are mentioned in the article, “One Bird” and “For Your Love”, and the article calls them provisional titles of two of their new songs.