I first heard the song, "Jealous Guy," when John Lennon recorded it sometime before his death in 1980. I actually thought it was an original of his. Turns out, it wasn't. Here is a 1972 recording of "Jealous Guy" by Donny Hathaway.UPDATE: a reader has correctly pointed out that Lennon recorded the song in 1971, and it was an original. Hathaway's version is the cover. Ooops.