Leigh Adrian Harline (March 26, 1907 – December 10, 1969) was an American film composer and songwriter. He was known for his "musical sophistication that was uniquely 'Harline-esque' by weaving rich tapestries of mood-setting underscores and penning memorable melodies for animated shorts and features."

Source: Wikipedia (https://en.wikipedia.org/wiki/Leigh_Harline)