The lyrics "Do you remember, the 21st night of September" were sung by which vocal group?

It was the group Earth, Wind and Fire that sung the lyrics "Do you remember, the 21st night of September". During the peak of their popularity in 1978, Earth, Wind & Fire needed a new single to include on their first album of greatest hits. The song “September” (1978), with the lyrics "Do you remember, the 21st night of September" and using a chord progression written by guitarist Al McKay with major input from vocalist Maurice White and songwriter Allee, was written to help drive album sales.

Released as a single in November, “September” reached No. 8 on Billboard’s pop chart and No. 1 on its R&B chart.

This band's most successful period started with their 1975 album "That's The Way of The World" and continued through the rest of the decade of the 70's. Their great hits included "September", "Shining Star", "Let's Groove", "Serpentine Fire", ''That's the Way of the World", and a cover of the Beatles' "Got to Get You Into My Life".

To recognize their greatness, music critics and fans point to Earth, Wind and Fire and note facts about it being an American band that has spanned the musical genres of R&B, soul, funk, jazz, disco, pop, rock, dance, Latin, and Afro-pop. This is a band that has been described as one of the most innovative and commercially successful of all time.