The Bird Who Saved The World (Chinese: 什麼鳥日子; pinyin: Shén me niǎo rì zi) is the soundtrack album to the film of the same name by William Wei. It is also the second EP by Wei. The EP was released on January 12, 2012, by Linfair Records.[1] It has three tracks, 'The Day of Bird' (鳥日子) performed by Wei and two instrumentals tracks.[1] 'The Day of Bird' is the theme song of the movie and was written by Wei about his fears of an uncertain future after completing his military service.[2]