Even Barack Obama sung it. He should have used this arrangement. Al Green wrote the song in 1972. It remained on the Billboard Hot 100 for 16 weeks.
It is covered by hundreds but I love the Roberta Flack slow soulfull version wih the funky afterparty. It is what I used as a frame for the big band arrangement here.
Unfortunately no audio of the arrangement yet but search for Roberta Flack's version to get an impression of the feel. Wait for the funky end.
Maybe this link will help you to find it on Spotify: