Question: What vocal and instrumental duo consisting of siblings Karen (1950-1983) and Richard Carpenter (b. 1946) covered Tim Hardin's "Reason to Believe"?
Sentence (from "The Carpenters"): Producing a distinctively soft musical style, which combined Karen's contralto vocals with Richard's arranging and composition skills, they became one of the best-selling music artists of all time.
Relevant evidence: No