I'm Moving On was originally recorded for the album released how long before John Lennon's death?
I'm Moving On (Yoko Ono song):  It was originally recorded for 1980's "Double Fantasy" album, with John Lennon. Double Fantasy:  Though initially poorly received, Lennon was murdered three weeks after its release, whereupon it became a worldwide commercial success, and went on to win the 1981 Album of the Year at the 24th Annual Grammy Awards.
three weeks