J.J. Cale (singer/songwriter) wrote this and released it as a demo initially, the first time Cale heard Clapton's version was on the radio.
Clapton later recorded other Cale songs, including "Cocaine" and "I'll Make Love To You Anytime."
According to Cale "I was dirt poor, not making enough to eat and I wasn't a young man. I was in my thirties, so I was very happy. It was nice to make some money."

This was Clapton's first single as a solo artist.