 While the show itself was unsuccessful , it did spawn a hit song . " You Don 't Bring Me Flowers " , which had been written with the intention of its being the theme song , was recorded by Neil Diamond and Barbra Streisand and made it to # 1 on the Billboard Hot 100 . By the time the show made it to air , another song had been chosen as the theme . The replacement , " Genesis Revisited " , was later described by the New York Times as " sparkl [ ing ] with witty rhymes and a punchy good humor " . The song was performed by Kenny Rankin . The lyrics for both songs were written by Alan and Marilyn Bergman ( the music for " Genesis Revisited " is credited solely to Alan Bergman ) . 
