Robert B. and Richard M. Sherman are responsible for some of the most memorable music from anyone's childhood. The "official" composers for many of Disney's most successful films, such as Mary Poppins, The Jungle Book, The Aristocats, Bedknobs and Broomsticks, and The Many Adventures of Winnie the Pooh, the brothers also composed the music for some of his theme park's most popular attractions, such as It's A Small World and The Enchanted Tiki Room. Working outside the Disney company, they also provided scores for many popular musicals such as Chitty Chitty Bang Bang, Charlotte's Web and An American Tale.
Recently, a documentary about them was released, called "The Boys: The Sherman Brothers Story." The trailer for it is above, and it will give you some idea of the breadth and scope of their extraordinary work.
There are probably better known composers, but I doubt that there are any better loved composers than Robert B. and Richard M. Sherman!