In 1956, blues legend, bassist, and writer Willie Dixon wrote 'I Can't Quit You Baby', for another blues great Otis Rush, for the Cobra Label. It was a success at the time, reaching #6 on the R&B charts. It also was inducted into the Blues Hall of Fame in 1994.
This standard is the subject of a huge scandal with Led Zeppelin; because they recorded it on their debut album, without giving proper credit, which led to a lawsuit by Willie Dixon in the 70's. Eventually his name was on the writing credits on later reissues.
It has been covered many times by dozens of artists, including: