: The song is built on a "slinking, spritely" groove that famously speeds up as it progresses. It starts at roughly 124 BPM and reaches nearly 129 BPM by the final fade-out, a tempo drift that many believe contributes to its natural, energetic feel.
: 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. Earth, Wind & Fire - September (Official HD Video)
The opening line— "Do you remember the 21st night of September?" —is one of the most famous lyrics in pop history. : The song is built on a "slinking,