The Wilson Brothers from the Greenwood neighborhood of Tulsa, OK were The GAP Band. Despite urban legend, this song is not about the 1921 bombing of that neighborhood, but rather about a surprising end to a relationship. The song WAS considering questionable because of this - and the origin of the band's name, as "GAP" in the bands names came about from the names of the streets where the bombs were actually dropped, Green, Archer, and Pine.
Yeah. I went dark. But this song went a different kind of dark - sadness sung over synth. It ended up sparking one of their biggest hits, hitting the Top 40 on the pop charts and #2 on what was known as the Black Singles chart - and is now the R&B chart - in 1982.