Funk/pop superstars Kool and the Gang, best known for 1980’s uptempo mega-hit “Celebrate,” took a decidedly mellower turn in the early 80s. According to AllMusic, the band “left the fast lanes of funk for the smoother ride of the adult-oriented R&B expressway.” The 1983 album In the Heart produced a lead single, “Joanna,” which hit #2 (pop) in the US, #2 (pop) in the UK, and #1 on the US R&B chart.
No stranger to a broad harmonic vocabulary, the band outdid itself on the mod scale with the ballad “September Love,” a non-single track. Modulations begin with an almost jarring early shift as the first verse starts at 0:21, followed by more key changes at 1:15, 1:49, 2:43, 3:18, and 3:59.