Maurice White, the main creative force behind Earth, Wind and Fire, co-wrote "Let's Groove," and he was clearly searching for an updated sound. He used a vocoder to create the intro; this funky futuristic vibe is accentuated by the video. In particular, I love the costumes and the video effects (the video was made using the classic Scanimate computer system, commonly used in the 1970's and early 1980's).
"Let's Groove" peaked at #3, while the Raise LP peaked at #5. In my book, it is noteworthy that even during their descent, E, W & F were still churning out some really solid music.
While the band soldiered on, they did not have any top 40 hits after 1982, and their album releases became less frequent, as well. However, they continue to perform (with Maurice White) to this day.