William "Bill" B. Lava was an American composer and arranger, who composed and conducted music for many feature films as well as that for the Warner Bros.' Looney Tunes and Merrie Melodies animated cartoons from 1962 to 1969, replacing the deceased Milt Franklyn, making him the last composer and arranger in the classic era of Warner Bros. Cartoons.

For Walt Disney Productions in the mid-1950s, Lava wrote or co-wrote the music for Zorro and the Spin and Marty and Hardy Boys segments of The Mickey Mouse Club. While Lava did not write any of it for Disney, he is credited with the score for 1955's TV segment, The Story of the Silly Symphony.

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