Did You Remember? Earth, Wind & Fire's 'September' Returns to the Charts After '21st of September'

Tabatha Fireman/Redferns
Earth Wind & Fire perform on the Main Stage as headlining act on Day 3 of Love Supreme Festval on July 1, 2018 in Brighton, England. 

The song hits No. 1 on R&B Digital Song Sales.

Clearly, you remember.

Earth, Wind & Fire's classic hit "September" debuts on Billboard's Digital Song Sales chart (dated Oct. 6) at No. 26 with 9,000 downloads sold, marking a 215 percent surge, in the Sept. 21-27 tracking week, according to Nielsen Music. The song concurrently hits No. 1 on the R&B Digital Song Sales chart for the first time, leaping from No. 10, and re-enters the R&B/Hip-Hop Digital Song Sales chart at No. 10, a new peak.

Surely sparking the song's gain? Its opening lyric: "Do you remember the 21st night of September?"

"September" also debuts at No. 7 on R&B Streaming Songs with 8.5 million U.S. streams, up 100 percent.

"September" saw its sharpest gains on, of course, Sept. 21, when it sold 5,000 downloads, a 788 percent increase from the day before. The track also logged 4.1 million on-demand U.S. streams (audio and video combined) on Sept. 21, up 386 percent from 847,000 the previous day.

Playing into the fun, Earth, Wind & Fire's Twitter account posted a poll on Sept. 21 asking followers simply, "Do you remember?" Of the half-million users who responded, 88 percent replied "yes."

The disco track is one of Earth, Wind & Fire's biggest chart hits. It peaked at No. 8 on the Billboard Hot 100 (dated Feb. 10, 1979) after spending a week at No. 1 on Hot R&B/Hip-Hop Songs (Jan. 13). It became the group's fourth top 10 (of seven total) on the Hot 100 and its sixth No. 1 (of an eventual eight) on Hot R&B/Hip-Hop Songs.