 Barbera and Hanna had a lasting impact on television animation . Cartoons they created often make greatest lists . Many of their characters have appeared in film , books , toys , and other media . Their shows had a worldwide audience of over 300 million people in the 1960s and have been translated into more than 20 languages . The works of Barbera and Hanna have been praised not only for their animation , but for their music . The Cat Concerto ( 1946 ) and Johann Mouse ( 1952 ) have both been called " masterpieces of animation " largely because of their classical music . 
