Question: What nationality was the guest star that sang "There are so many colors in the rainbow..."?
Sentence (from "Flowers Are Red"): While driving down the Long Island Expressway (the highway on which Chapin died), guest Sarah Jessica Parker relates that she and her siblings were the (uncredited) studio performers singing the chorus "There are so many colors in the rainbow..." Parker sings the chorus and Chapin's original version is excerpted.
Relevant evidence: Yes