“September” is a song by the band Earth, Wind & Fire released as a single in 1978 on ARC/Columbia Records. Initially included as a track for The Best of Earth, Wind & Fire, Vol. 1, “September” was very successful commercially and reached No. 1 on the US Billboard Hot R&B Songs chart, No. 8 on the US Billboard Hot 100, and No. 3 on the UK Singles Chart.

https://en.wikipedia.org/wiki/September_(Earth,_Wind_%26_Fire_song)