Question: Randy Van Horne, was an American singer and musician, his musical group performed the theme song, for which animated television series, that first ran on September 27, 1961?
Sentence (from "Randy Van Horne"): Van Horne's musical group, the Randy Van Horne Singers, performed the theme songs for many classic Hanna-Barbera cartoons including "The Flintstones", "Top Cat", "The Jetsons", and "The Huckleberry Hound Show".
Relevant evidence: Yes