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"It's the Falling in Love"
Date range assessed by the facts that the song was recorded in the first recording sessions (“The main sessions began in early December of 1978 in two West Hollywood studios, Allen Zentz Recording… Quincy also suggested Michael cover ‘It’s the Falling in Love’, a ballad which American singer Carole Bayer Sager had written and included on her own 1978 album, Too.”) and the first recording session ended in January 1979 (“Michael was forced to leave the studio in January 1979 to begin rehearsing with his brothers for their forthcoming Destiny Tour, which was due to kick off in the German city of Bremen on January 22.”) (Mike Smallcombe, “Making Michael”)
"It's the Falling in Love" Multitracks:
https://archive.org/details/itsthefallinginlovemultitracks-michaeljackson/