Written by the band’s front man Billie Joe Armstrong, the song is about the death of Armstrong’s father in September 1982 and his life since. The song’s lyrics have also been interpreted in other ways, including as a song about the victims and survivors of the September 11 attacks.
Wasn’t that song about 9/11?
https://en.wikipedia.org/wiki/Wake_Me_Up_When_September_Ends
Huh TIL