The songwriting/production duo of Kenneth Gamble and Leon Huff co-wrote this song with Anthony Jackson, who also played bass on the track. Gamble and Huff wrote many songs that helped define the Philadelphia Soul sound, including this one, which was recorded at Sigma Sound Studios in Philadelphia.
A key contributor to the song was Joe Tarsia, who was the engineer at Sigma. He had just installed an Eventide phaser in the control room, and when Jackson started playing, Tarsia tried recording the bass (with a wah-wah pedal) through the phaser. Gamble loved the effect, which provided a unique sound that made the song stand out on the airwaves.
Tarsia added effects to the background vocals as well, creating a reverse echo where the echo precedes the vocal, something Jimmy Page did on a few Led Zeppelin tracks, including "Whole Lotta Love