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He was the composer of many of the Hanna-Barbera cartoons' popular theme songs, including The Flintstones until 1981, Top Cat, The Jetsons, Jonny Quest, Superfriends, Josie and the Pussycats, The Smurfs and The New Scooby-Doo Movies and all its spinoffs until 1986. Beginning in 1959, Curtin also composed many of the stock tunes used as incidental music in the various Hanna-Barbera series. He also was the composer for the 1960 animated series Q.T. Hush, one of the first cartoons to appear in color. He also composed two of the tunes heard in the background in Plan 9 From Outer Space, although he was embarrassed by the film's poor cinematic quality.