"I Was Born About Ten Thousand Years Ago," although also from the point of view of someone who, who--so to say--was born about ten thousand years ago, is a very different song, just a brag. "Passing Through" has a strong theme which "Born," and the similar "Great Historical Bum" both lack, that of a common humanity shared by a race of mortal beings (unlike the narrators of all the songs, who go from era to era). Another difference: the narrator in "Passing Through" is an observer, not a heroic participant. The heroes are the mortals. (And "Just the Facts, Ma'am" is a melding of "Born" and "Bum," and is usually performed as a duet, a pair of competing liars. The alternating verses are sung to different melodies. --seed