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"ABC"

Date range confirmed in François Allard and Richard Lecocq’s “Michael Jackson: All the Songs: The Story Behind Every Track” (Recording - Sound Factory Studio, Los Angeles: December 1969”)

"ABC" (From the “ABC” album):

"ABC (Alternate Version)" (From the “I Want You Back! Unreleased Masters” album) (“Recorded 1970” [“I Want You Back! Unreleased Masters” liner notes (archived)]):