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From the L.A. Times

Randy Van Horne, whose Randy Van Horne Singers performed the theme songs for "The Flintstones," "The Jetsons," "The Huckleberry Hound Show" and several other popular television cartoons of the 1960s, has died. He was 83.

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From Spaceagepop.com

... Van Horne ... assembled a regular ensemble from among the session vocalists he worked with, and this group was signed to RCA Victor (and later, MGM) as the Randy Van Horne Singers. The group included perhaps the most famous session singer of all ... Marni Nixon, as well as Thurl Ravenscroft (the voice of Tony the Tiger), B.J. Baker, and Bob Zwern.

Esquivel was only one of dozens of arrangers to use Van Horne's singers. They sang the jazzy vocals on Bob Thompson great RCA albums, did their best to imitate African chants on Martin Denny's Afrodesia album, and recorded other cartoon show themes such as "The Jetsons." They also worked with ad men like Hugh Heller, and Van Horne kept his own composition skills in tune by writing jingles himself. On rare occasions, the group appeared live, usually a part of variety revues in Los Angeles and Las Vegas.

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Randy Van Horne

"Huzzah."