Watch: Millie Jackson - "If You're Not Back in Love by Monday"

LONDON - FEBRUARY 22: Singer Millie Jackson performs onstage at The Dominion Theatre on February 22, 1984, in London, England. (Photo by David Corio/Michael Ochs Archive/Getty Images)

Millie Jackson LONDON - FEBRUARY 22: Singer Millie Jackson performs onstage at The Dominion Theatre on February 22, 1984, in London, England. (Photo by David Corio/Michael Ochs Archive/Getty Images) (David Corio)

"If You're Not Back in Love by Monday" by Millie Jackson hit the Billboard R&B charts in 1978, peaking at #5.