"September" by Earth, Wind & Fire is a definitive anthem of 1970s soul and disco, recognized for its infectious rhythm and "cosmic optimism". Originally released in November 1978 to promote the band’s The Best of Earth, Wind & Fire, Vol. 1 compilation, the track has since evolved into a cross-generational cultural phenomenon.

: Willis initially struggled with White's use of the nonsensical "ba-dee-ya" throughout the chorus, but White eventually told her to "never let the lyric get in the way of the groove," a lesson Willis cited as the most important of her career. Visuals and Cultural Impact Earth, Wind & Fire - September (Official HD Video) knew remember bye oh uh you. YouTube·EarthWindandFireVEVO

: The track features the iconic interplay between Maurice White's baritone and Philip Bailey's soaring falsetto, backed by a full brass section. The "21st Night" Mystery

The opening line— "Do you remember the 21st night of September?" —is one of the most famous lyrics in pop history.

: Music theorists and critics often highlight the song's "unresolved" nature; the chorus uses four chords that continuously move forward without landing, mirroring the circularity of the four seasons.