David Bowie's seminal "Space Oddity", which began the story of Major Tom, was originally released in 1969. While Bowie would continue the story in subsequent releases, such as 1980's "Ashes to Ashes", German singer Peter Schilling reportedly reimagined "Oddity" as "Major Tom (Coming Home)" in 1983, which ye scribe thought was Schilling's idea of a sequel.
30 years later, "Space Oddity" resurfaced, and was reimagined as a sort-of duet for the soundtrack to the remake of "The Secret Life of Walter Mitty". Co-star Kristen Wiig (ex-Saturday Night Live), who plays the romantic interest of Ben Stiller's title character, is imagined playing guitar and serenading Mitty with "Space Oddity".
What happened? My best guess is that "Oddity" was remixed, with Wiig's vocals mixed with Bowie's original 1969 recording.
Decide for yourselves, effendis.