From AWN Headline News:
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Flintstones Composer Will Schaefer Passes Away
July 06, 2007

Will Schaefer, the composer on many Hanna-Barbara series, such as THE FLINTSTONES, THE YOGI BEAR SHOW and SCOOBY-DOO, WHERE ARE YOU!, passed away from cancer on Saturday, June 30, 2007, in Palm Desert, California. He was 78 years old.
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Schaefer also composed music for Walt Disney Studios and for Disneyland attractions. Details and the full story here: AWN Headline News