My favourite song ever is Jacques Brel’s Ne Me Quitte Pas. I avoid the saccharine version called If You Go Away, even though Scott Walker sang it, and base my version on one I found on a now-deleted EP by Momus, who gets to the the heart of Brel’s words.
Sid Smith has written a good little piece about the song, with a compelling video of Brel singing it. Sid Smith on Brel.