After an early attempt at this song on 27 January 1969 during the Let It Be sessions , Lennon announced , `` Just heard that Yoko 's divorce has just gone through '' , after which he and the band burst into an improvised version of the song , singing `` I 'm free at last '' instead of a part of the lyric . After an early attempt at this song on 27 January 1969 during the Let It Be sessions , Lennon announced , `` Just heard that Yoko 's divorce has just gone through '' , after which he and the band burst into an improvised version of the song , substituting `` I 'm free at last '' for a part of the lyric .